[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/utils/x86/assembler_x86_test.cc b/compiler/utils/x86/assembler_x86_test.cc
index d901673..fccb510 100644
--- a/compiler/utils/x86/assembler_x86_test.cc
+++ b/compiler/utils/x86/assembler_x86_test.cc
@@ -105,6 +105,18 @@
   DriverStr(expected, "movl");
 }
 
+TEST_F(AssemblerX86Test, psrlq) {
+  GetAssembler()->psrlq(x86::XMM0, CreateImmediate(32));
+  const char* expected = "psrlq $0x20, %xmm0\n";
+  DriverStr(expected, "psrlq");
+}
+
+TEST_F(AssemblerX86Test, punpckldq) {
+  GetAssembler()->punpckldq(x86::XMM0, x86::XMM1);
+  const char* expected = "punpckldq %xmm1, %xmm0\n";
+  DriverStr(expected, "punpckldq");
+}
+
 TEST_F(AssemblerX86Test, LoadLongConstant) {
   GetAssembler()->LoadLongConstant(x86::XMM0, 51);
   const char* expected =