[AArch64] Implement TARGET_GIMPLE_FOLD_BUILTIN for aarch64 backend.

[James Greenhalgh]

Hi,

This patch supersedes the patch by Tejas here:
http://gcc.gnu.org/ml/gcc-patches/2013-03/msg00502.html

The patch uses the new TARGET_GIMPLE_FOLD_BUILTIN mechanism rather
than TARGET_FOLD_BUILTIN.

This patch therefore adds the infrastructure for
TARGET_GIMPLE_FOLD_BUILTIN and an implementation folding addv
to REDUC_PLUS_EXPR.

Regression tested on aarch64-none-elf with no regressions.

Thanks,
James Greenhalgh

---
gcc/

2013-04-25  James Greenhalgh  <james.greenhalgh@arm.com>
	    Tejas Belagod  <tejas.belagod@arm.com>

	* config/aarch64/aarch64-builtins.c
	(aarch64_gimple_fold_builtin): New.
	* config/aarch64/aarch64-protos.h (aarch64_gimple_fold_builtin): New.
	* config/aarch64/aarch64-simd-builtins.def (addv): New.
	* config/aarch64/aarch64-simd.md (addpv4sf): New.
	(addvv4sf): Update.
	* config/aarch64/aarch64.c (TARGET_GIMPLE_FOLD_BUILTIN): Define.

gcc/testsuite/

2013-04-25  James Greenhalgh  <james.greenhalgh@arm.com>
	    Tejas Belagod  <tejas.belagod@arm.com>

	* gcc.target/aarch64/vaddv-intrinsic.c: New.
	* gcc.target/aarch64/vaddv-intrinsic-compile.c: Likewise.
	* gcc.target/aarch64/vaddv-intrinsic.x: Likewise.
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