msp430: Fix bug regarding large memory model inferior function call arguments.

msp430: Fix bug regarding large memory model inferior function call arguments.

This change causes reference, struct, and union arguments to be treated
the same as pointer arguments when determining the size of the value to
place into a register.

The case for doing this for reference arguments is obvious.

The msp430 ABI specifies that struct and union arguments are passed by
reference.  This is why they're treated in the same manner as pointer
and reference arguments when computing the size of the value to place
into a register.

In my testing using this multilib...

msp430-sim/-msim/-mcpu=msp430x/-mlarge/-mdata-region=either/-mcode-region=either

... I find that the the following failures, 125 in all, are fixed by this
patch.

FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns char
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns short
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns int
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns long
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns float
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns double
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns float _Complex
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns double _Complex
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns long double _Complex
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns char *
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns char
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns short
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns int
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns long
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns float
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns double
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns float _Complex
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns double _Complex
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns long double _Complex
FAIL: gdb.base/callfuncs.exp: noproto: call inferior func with struct - returns char *
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 7 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 8 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 9 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 10 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 11 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 12 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 13 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 14 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 15 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 16 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 17 structs-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-tll
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tll
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-td
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-td
FAIL: gdb.base/structs.exp: p/c L<n>; call 1 structs-tld
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tld
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 7 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 8 structs-ts-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-ti-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-ti-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-ti-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-ti-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-ti-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tl-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tl-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tl-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-tl-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-tl-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tll-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tf-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tf-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tf-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-tf-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-tf-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-td-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tld-tc
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tc-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tc-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 5 structs-tc-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 6 structs-tc-ts
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tc-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tc-ti
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tc-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tc-tl
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-tll
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 3 structs-tc-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 4 structs-tc-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-td
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tc-tld
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-td-tf
FAIL: gdb.base/structs.exp: p/c L<n>; call 2 structs-tf-td
FAIL: gdb.cp/classes.exp: call class_param.Aref_a (g_A)
FAIL: gdb.cp/classes.exp: call class_param.Aref_x (g_A)
FAIL: gdb.cp/classes.exp: call class_param.Aref_a (g_B)
FAIL: gdb.cp/classes.exp: call class_param.Aref_x (g_B)
FAIL: gdb.cp/classes.exp: call class_param.Aval_a (g_A)
FAIL: gdb.cp/classes.exp: call class_param.Aval_x (g_A)
FAIL: gdb.cp/classes.exp: call class_param.Aval_a (g_B)
FAIL: gdb.cp/classes.exp: call class_param.Aval_x (g_B)
FAIL: gdb.cp/ref-params.exp: print value of f1 on Child in main
FAIL: gdb.cp/ref-params.exp: print value of f2 on Child in main
FAIL: gdb.cp/ref-params.exp: print value of f1 on (Child&) in main
FAIL: gdb.cp/ref-params.exp: print value of f2 on (Child&) in main
FAIL: gdb.cp/ref-params.exp: print value of f1 on Child& in f2
FAIL: gdb.cp/ref-params.exp: print f1(MQ)
FAIL: gdb.cp/ref-params.exp: print mf1(MQ)
FAIL: gdb.cp/ref-params.exp: print mf2(MQ)
FAIL: gdb.cp/ref-params.exp: print f1(MQR)
FAIL: gdb.cp/ref-params.exp: print mf1(MQR)
FAIL: gdb.cp/ref-params.exp: print mf2(MQR)
FAIL: gdb.python/py-xmethods.exp: Before: a1 + a2
FAIL: gdb.python/py-xmethods.exp: Before: a2 - a1
FAIL: gdb.python/py-xmethods.exp: Before: b1 - a1
FAIL: gdb.python/py-xmethods.exp: After: a2 - a1
FAIL: gdb.python/py-xmethods.exp: After: b1 - a1

gdb/ChangeLog:

	* msp430-tdep.c (msp430_push_dummy_call): Treat reference, struct,
	and union arguments the same as pointer arguments when determining
	size of argument.