PR target/82196 addendum: Fix Darwin build breakage and test FAILS on Solaris

PR target/82196 addendum: Fix Darwin build breakage and test FAILS on Solaris

gcc/testsuite:
	* gcc.target/i386/pr82196-1.c: (b): Remove volatile asm.
	* gcc.target/i386/pr82196-2.c: (b): Likewise.

libgcc:
	* configure.ac: Add Check for HAVE_AS_AVX.
	* config.in: Regenerate.
	* configure: Likewise.
	* config/i386/i386-asm.h: Include auto-target.h from libgcc.
	(SSE_SAVE, SSE_RESTORE): Emit .byte sequence for !HAVE_AS_AVX.
	Correct out-of-date comments.

From-SVN: r253116