rs6000-c.c: Add macro definitions for ALTIVEC_BUILTIN_VEC_PERMXOR.

rs6000-c.c: Add macro definitions for ALTIVEC_BUILTIN_VEC_PERMXOR.

gcc/ChangeLog:

2018-03-14  Carl Love  <cel@us.ibm.com>

	* config/rs6000/rs6000-c.c: Add macro definitions for
	ALTIVEC_BUILTIN_VEC_PERMXOR.
	* config/rs6000/rs6000.h: Add #define for vec_permxor builtin.
	* config/rs6000/rs6000-builtin.def: Add macro expansions for VPERMXOR.
	* config/rs6000/altivec.md (altivec_vpermxor): New define expand.
	* config/rs6000/rs6000-p8swap.c (rtx_is_swappable_p): Add case
	UNSPEC_VPERMXOR.
	* config/doc/extend.texi: Add prototypes for vec_permxor.

gcc/testsuite/ChangeLog:

2018-03-14  Carl Love  <cel@us.ibm.com>

	* gcc.target/powerpc/builtins-7-runnable.c: New test file.

From-SVN: r258530