Don't fold builtin into gimple when isa mismatches.

Don't fold builtin into gimple when isa mismatches.

The patch fixes ICE in ix86_gimple_fold_builtin.

gcc/ChangeLog:

	PR target/104666
	* config/i386/i386-expand.cc
	(ix86_check_builtin_isa_match):	New func.
	(ix86_expand_builtin): Move code to
	ix86_check_builtin_isa_match and call it.
	* config/i386/i386-protos.h
	(ix86_check_builtin_isa_match): Declare.
	* config/i386/i386.cc (ix86_gimple_fold_builtin): Don't fold
	builtin into gimple when isa mismatches.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr104666.c: New test.