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Port memory barriers intrinsics to AArch64

Authored by kongyi on Jul 17 2014, 3:52 AM.

Description

Port memory barriers intrinsics to AArch64

Memory barrier __builtin_arm_[dmb, dsb, isb] intrinsics are required to
implement their corresponding ACLE and MSVC intrinsics.

This patch ports ARM dmb, dsb, isb intrinsic to AArch64.

Requires LLVM r213247.

Differential Revision: http://reviews.llvm.org/D4521

llvm-svn: 213250

Details