[AArch64] Restrict pic-small.c by new test directive

[AArch64] Restrict pic-small.c by new test directive

2015-07-01  Jiong Wang  <jiong.wang@arm.com>

      gcc/
	* doc/sourcebuild.texi (AArch64-specific attributes): New subsection.
	Document "aarch64_small_fpic".

      gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_aarch64_small_fpic): New function.
	* gcc.target/aarch64/pic-small.c: Restrict this test under
	check_effective_target_aarch64_small_fpic.

From-SVN: r225232