[Atomics] Add dmb/dsb/isb instructions to ARM

src/arm/constants-arm.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM_CONSTANTS_ARM_H_
 #define V8_ARM_CONSTANTS_ARM_H_
 
 #include <stdint.h>
 
 #include "src/base/logging.h"
@@ skipping 201 matching lines @@
   kCoprocessorMask = 15 << 8,
   kOpCodeMask = 15 << 21,  // In data-processing instructions.
   kImm24Mask = (1 << 24) - 1,
   kImm16Mask = (1 << 16) - 1,
   kImm8Mask = (1 << 8) - 1,
   kOff12Mask = (1 << 12) - 1,
   kOff8Mask = (1 << 8) - 1
 };
 
 
+enum BarrierOption {
+  OSHLD = 0x1,
+  OSHST = 0x2,
+  OSH = 0x3,
+  NSHLD = 0x5,
+  NSHST = 0x6,
+  NSH = 0x7,
+  ISHLD = 0x9,
+  ISHST = 0xa,
+  ISH = 0xb,
+  LD = 0xd,
+  ST = 0xe,
+  SY = 0xf,
+};
+
+
 // -----------------------------------------------------------------------------
 // Addressing modes and instruction variants.
 
 // Condition code updating mode.
 enum SBit {
   SetCC   = 1 << 20,  // Set condition code.
   LeaveCC = 0 << 20   // Leave condition code unchanged.
 };
 
 
@@ skipping 467 matching lines @@
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_