[AArch64] Support for CLZ

[Vidya Praveen]

Hello,

This patch adds support to AdvSIMD CLZ instruction and adds tests for the same.
Regression test done for aarch64-none-elf with no issues.

OK?

Regards
VP

---

gcc/ChangeLog

2013-05-22  Vidya Praveen <vidyapraveen@arm.com>

	* config/aarch64/aarch64-simd.md (clzv4si2): Support for CLZ
	  instruction (AdvSIMD).
	* config/aarch64/aarch64-builtins.c
	  (aarch64_builtin_vectorized_function): Handler for BUILT_IN_CLZ.
	* config/aarch64/aarch-simd-builtins.def: Entry for CLZ.
	* testsuite/gcc.target/aarch64/vect-clz.c: New file.
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