[optimizing compiler] Add support for volatile

- for backends: arm, x86, x86_64
- added necessary instructions to assemblies
- clean up code gen for field set/get
- fixed InstructionDataEquals for some instructions
- fixed comments in compiler_enums

* 003-opcode test verifies basic volatile functionality

Change-Id: I144393efa312dfb2c332cb84056b00edffee338a
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index aed06c0..636f884 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -18,6 +18,7 @@
 #define ART_COMPILER_OPTIMIZING_CODE_GENERATOR_X86_H_
 
 #include "code_generator.h"
+#include "dex/compiler_enums.h"
 #include "nodes.h"
 #include "parallel_move_resolver.h"
 #include "utils/x86/assembler_x86.h"
@@ -105,6 +106,8 @@
   void HandleBitwiseOperation(HBinaryOperation* instruction);
   void HandleInvoke(HInvoke* invoke);
   void HandleShift(HBinaryOperation* instruction);
+  void HandleFieldSet(HInstruction* instruction, const FieldInfo& field_info);
+  void HandleFieldGet(HInstruction* instruction, const FieldInfo& field_info);
 
   CodeGeneratorX86* const codegen_;
   InvokeDexCallingConventionVisitor parameter_visitor_;
@@ -137,6 +140,9 @@
   void GenerateShlLong(const Location& loc, Register shifter);
   void GenerateShrLong(const Location& loc, Register shifter);
   void GenerateUShrLong(const Location& loc, Register shifter);
+  void GenerateMemoryBarrier(MemBarrierKind kind);
+  void HandleFieldSet(HInstruction* instruction, const FieldInfo& field_info);
+  void HandleFieldGet(HInstruction* instruction, const FieldInfo& field_info);
 
   X86Assembler* const assembler_;
   CodeGeneratorX86* const codegen_;