Add the new @llvm.nacl.atomic.fence.all intrinsic

include/llvm/IR/NaClAsm.h

+//===-- llvm/IR/NaClAsm.h - NaCl Assembly Handling --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides utilities for NaCl's handling of assembly.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_NACL_ASSEMBLY_H
+#define LLVM_IR_NACL_ASSEMBLY_H
+
+#include "llvm/IR/Instruction.h"
+
+namespace llvm {
+
+namespace NaCl {
+
+/// Returns true if the Instruction corresponds to ``asm("":::"memory")``,
+/// This is often used as a compiler barrier and NaCl tries to handle it
+/// gracefully.
+bool isAsmMemory(const Instruction *I);
+
+} // End NaCl namespace
+
+} // End llvm namespace
+
+#endif