rs6000.c (rs6000_option_override_internal): Issue warning message if user requests...

rs6000.c (rs6000_option_override_internal): Issue warning message if user requests -maltivec=be.

gcc/ChangeLog:

2018-02-14  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* config/rs6000/rs6000.c (rs6000_option_override_internal): Issue
	warning message if user requests -maltivec=be.
	* doc/invoke.texi: Document deprecation of -maltivec=be.

gcc/testsuite/ChangeLog:

2018-02-14  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* gcc.dg/vmx/extract-be-order.c: Disable -maltivec=be warning so
	this test case still works ok.
	* gcc.dg/vmx/extract-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/insert-be-order.c: Likewise.
	* gcc.dg/vmx/insert-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/ld-be-order.c: Likewise.
	* gcc.dg/vmx/ld-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/lde-be-order.c: Likewise.
	* gcc.dg/vmx/ldl-be-order.c: Likewise.
	* gcc.dg/vmx/ldl-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/merge-be-order.c: Likewise.
	* gcc.dg/vmx/merge-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/mult-even-odd-be-order.c: Likewise.
	* gcc.dg/vmx/pack-be-order.c: Likewise.
	* gcc.dg/vmx/perm-be-order.c: Likewise.
	* gcc.dg/vmx/splat-be-order.c: Likewise.
	* gcc.dg/vmx/splat-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/st-be-order.c: Likewise.
	* gcc.dg/vmx/st-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/ste-be-order.c: Likewise.
	* gcc.dg/vmx/stl-be-order.c: Likewise.
	* gcc.dg/vmx/stl-vsx-be-order.c: Likewise.
	* gcc.dg/vmx/sum2s-be-order.c: Likewise.
	* gcc.dg/vmx/unpack-be-order.c: Likewise.
	* gcc.dg/vmx/vsums-be-order.c: Likewise.
	* gcc.target/powerpc/vec-setup-be-long.c: Likewise.

From-SVN: r257668