[AArch64] Add ACLE feature macro for ARMv8.1 Adv.SIMD instructions.

	* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Add
	ARM_FEATURE_QRDMX.

From-SVN: r230969

gcc/ChangeLog

+2015-11-26  Matthew Wahab  <matthew.wahab@arm.com>
+
+	* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Add
+	ARM_FEATURE_QRDMX.
+
 2015-11-26  Pierre-Marie de Rodat  <derodat@adacore.com>
 
 	PR debug/53927

gcc/config/aarch64/aarch64-c.c

@@ -126,6 +126,7 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
   aarch64_def_or_undef (TARGET_ILP32, "__ILP32__", pfile);
 
   aarch64_def_or_undef (TARGET_CRYPTO, "__ARM_FEATURE_CRYPTO", pfile);
+  aarch64_def_or_undef (TARGET_SIMD_RDMA, "__ARM_FEATURE_QRDMX", pfile);
 }
 
 /* Implement TARGET_CPU_CPP_BUILTINS.  */