i386.opt (msgx): Use ix86_isa_flags2 variable.

i386.opt (msgx): Use ix86_isa_flags2 variable.

	* config/i386/i386.opt (msgx): Use ix86_isa_flags2 variable.
	* config/i386/i386.c (ix86_target_string): Add missing options
	to isa_opts and reorder options by implied ISAs.  Rename isa_opts2 to
	isa2_opts, ix86_flag_opts to flag2_opts, ix86_target_other to
	flags_other and ix86_target_other to flags2_other.  Display unknown
	isa2 options.
	(ix86_valid_target_attribute_inner_p): Add missing options and
	reorder options by implied ISAs, as in ix86_target_string.

testsuite/ChangeLog:

	* gcc.target/i386/funcspec-56.inc: Add missing options and
	reorder options by implied ISAs, as in ix86_target_string.

From-SVN: r244452