* config/i386/xmmintrin.h (enum _mm_hint) <_MM_HINT_ET0>: Correct
	hint value.
	(_mm_prefetch): Move out of GCC target("sse") pragma.
	* config/i386/prfchwintrin.h (_m_prefetchw): Move out of
	GCC target("prfchw") pragma.
	* config/i386/i386.md (prefetch): Emit prefetchwt1 only
	for locality <= 2.
	* config/i386/i386.c (ix86_option_override_internal): Enable
	-mprfchw with -mprefetchwt1.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208296 138bc75d-0d04-0410-961f-82ee72b054a4