Allow mmintrin headers to work with function specific target opts.

Allow mmintrin headers to work with function specific target opts.

Allow mmintrin headers to work with function specific target opts.  Please
see discussion here:
http://gcc.gnu.org/ml/gcc-patches/2013-04/msg00740.html

	* config/i386/i386.c (ix86_pragma_target_parse):  Restore target
	when current target options does not apply.
	* config/i386/i386-protos.h (ix86_reset_previous_fndecl): New function.
	* config/i386/i386.c (ix86_reset_previous_fndecl): Ditto.
	* config/i386/bmiintrin.h: Pass appropriate target attributes to header.
	* config/i386/mmintrin.h: Ditto.
	* config/i386/nmmintrin.h: Ditto.
	* config/i386/avx2intrin.h: Ditto.
	* config/i386/fxsrintrin.h: Ditto.
	* config/i386/tbmintrin.h: Ditto.
	* config/i386/xsaveintrin.h: Ditto.
	* config/i386/f16cintrin.h: Ditto.
	* config/i386/xtestintrin.h: Ditto.
	* config/i386/xsaveoptintrin.h: Ditto.
	* config/i386/bmi2intrin.h: Ditto.
	* config/i386/lzcntintrin.h: Ditto.
	* config/i386/smmintrin.h: Ditto.
	* config/i386/wmmintrin.h: Ditto.
	* config/i386/x86intrin.h: Remove all header include guards.
	* config/i386/prfchwintrin.h: Ditto.
	* config/i386/pmmintrin.h: Ditto.
	* config/i386/tmmintrin.h: Ditto.
	* config/i386/xmmintrin.h: Ditto.
	* config/i386/popcntintrin.h: Ditto.
	* config/i386/rdseedintrin.h: Ditto.
	* config/i386/ammintrin.h: Ditto.
	* config/i386/emmintrin.h: Ditto.
	* config/i386/immintrin.h: Remove all header include guards.
	* config/i386/fma4intrin.h: Ditto.
	* config/i386/lwpintrin.h: Ditto.
	* config/i386/xopintrin.h: Ditto.
	* config/i386/ia32intrin.h: Ditto.
	* config/i386/avxintrin.h: Ditto.
	* config/i386/rtmintrin.h: Ditto.
	* config/i386/fmaintrin.h: Ditto.
	* config/i386/mm3dnow.h: Ditto.

	* testsuite/gcc.target/i386/intrinsics_1.c: New test.
	* testsuite/gcc.target/i386/intrinsics_2.c: Ditto.
	* testsuite/gcc.target/i386/intrinsics_3.c: Ditto.
	* testsuite/gcc.target/i386/intrinsics_4.c: Ditto.
	* testsuite/gcc.target/i386/intrinsics_5.c: Ditto.
	* testsuite/gcc.target/i386/intrinsics_6.c: Ditto.
	* testsuite/gcc.target/i386/avx-1.c: Provide macros for builtins
	needing immediate arguments in f16cintrin.h and rtmintrin.h.

From-SVN: r200349