[AArch64] Fall back to -fPIC if no support of -fpic relocation modifer in assembler

[Jiong Wang]

This patch fix the breakage caused by

  https://gcc.gnu.org/ml/gcc-patches/2015-06/msg01913.html

We fall back to -fPIC if there is no assembler support on those new
relocation modifiers for -fpic.

OK for trunk?

gcc/
  * configure.ac: Add check for aarch64 assembler -fpic relocation
  modifier support.
  * configure: Regenerate.
  * config.in: Regenerate.
  * config/aarch64/aarch64.c (initialize_aarch64_code_model): Fall back to
  -fPIC if not support of -fpic relocation modifier in assembler.
-- 
Regards,
Jiong

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