[PATCH][AArch64] Vector shift by 64 fix

[PATCH][AArch64] Vector shift by 64 fix

gcc/

	* config/aarch64/aarch64-simd-builtins.def (ashr): DI mode removed.
	(ashr_simd): New builtin handling DI mode.
	* config/aarch64/aarch64-simd.md (aarch64_ashr_simddi): New pattern.
	(aarch64_sshr_simddi): New match pattern.
	* config/aarch64/arm_neon.h (vshr_n_s32): Builtin call modified.
	(vshrd_n_s64): Likewise.
	* config/aarch64/predicates.md (aarch64_shift_imm64_di): New predicate.

gcc/testsuite/

	* gcc.target/aarch64/sshr64_1.c: New testcase.

From-SVN: r206978