[AArch64] Support for ARMv8.1a Adv.SIMD instructions

[AArch64] Support for ARMv8.1a Adv.SIMD instructions

2015-06-02  Matthew Wahab  <matthew.wahab@arm.com>

gas/
  * config/tc-aarch64.c (aarch64_features): Add "rdma".
  * doc/c-aarch64.texi (AArch64 Extensions): Add "rdma".

gas/testsuite/
  * rdma-directive.d: New.
  * rdma.d: New.
  * rdma.s: New.

include/opcode/
  * aarch64.h (AARCH64_FEATURE_RDMA): New.

opcode/
  * aarch64-tbl.h (aarch64_feature_rdma): New.
  (RDMA): New.
  (aarch64_opcode_table): Add "sqrmlah" and "sqrdmlsh" instructions.
  * aarch64-asm-2.c: Regenerate.
  * aarch64-dis-2.c: Regenerate.
  * aarch64-opc-2.c: Regenerate.