d: Add support for vector comparison operators

d: Add support for vector comparison operators

The front-end added semantic support to permit comparing two vector
expressions.  This removes the restriction in the code generator, as
well as the intrisics that previously exposed the same operation.

gcc/d/ChangeLog:

	* d-target.cc (Target::isVectorOpSupported): Remove cases for
	comparison operators.
	* intrinsics.cc (maybe_set_intrinsic): Remove cases for vector
	comparison intrinsics.
	(maybe_warn_intrinsic_mismatch): Likewise.
	(expand_intrinsic_vec_cond): Remove.
	(maybe_expand_intrinsic): Remove cases for vector comparison
	intrinsics.
	* intrinsics.def (INTRINSIC_EQUALMASK): Remove.
	(INTRINSIC_NOTEQUALMASK): Remove.
	(INTRINSIC_GREATERMASK): Remove.
	(INTRINSIC_GREATEREQUALMASK): Remove.

libphobos/ChangeLog:

	* libdruntime/gcc/simd.d (equalMask): Implement using generics.
	(notEqualMask): Likewise.
	(greaterMask): Likewise.
	(greaterOrEqualMask): Likewise.
	(notMask): Likewise.
	(andAndMask): Likewise.
	(orOrMask): Likewise.

gcc/testsuite/ChangeLog:

	* gdc.dg/Wbuiltin_declaration_mismatch2.d: Remove comparision tests.
	* gdc.dg/simd2a.d: Update comparison tests.
	* gdc.dg/simd2b.d: Likewise.
	* gdc.dg/simd2c.d: Likewise.
	* gdc.dg/simd2d.d: Likewise.
	* gdc.dg/simd2e.d: Likewise.
	* gdc.dg/simd2f.d: Likewise.
	* gdc.dg/simd2g.d: Likewise.
	* gdc.dg/simd2h.d: Likewise.
	* gdc.dg/simd2i.d: Likewise.
	* gdc.dg/simd2j.d: Likewise.