Use V8_FINAL and V8_OVERRIDE in various places, fixing bugs revealed by them.

src/lithium.h

Index: src/lithium.h
diff --git a/src/lithium.h b/src/lithium.h
index 3389472bc031f37a30899719708e0f8591acefe4..fd50ee8f8b9df0f20d5b5ac70682ca5d633b6177 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -271,7 +271,7 @@ class LUnallocated : public LOperand {
 };
 
 
-class LMoveOperands FINAL BASE_EMBEDDED {
+class LMoveOperands V8_FINAL BASE_EMBEDDED {
  public:
   LMoveOperands(LOperand* source, LOperand* destination)
       : source_(source), destination_(destination) {
@@ -317,7 +317,7 @@ class LMoveOperands FINAL BASE_EMBEDDED {
 };
 
 
-class LConstantOperand FINAL : public LOperand {
+class LConstantOperand V8_FINAL : public LOperand {
  public:
   static LConstantOperand* Create(int index, Zone* zone) {
     ASSERT(index >= 0);
@@ -342,7 +342,7 @@ class LConstantOperand FINAL : public LOperand {
 };
 
 
-class LArgument FINAL : public LOperand {
+class LArgument V8_FINAL : public LOperand {
  public:
   explicit LArgument(int index) : LOperand(ARGUMENT, index) { }
 
@@ -353,7 +353,7 @@ class LArgument FINAL : public LOperand {
 };
 
 
-class LStackSlot FINAL : public LOperand {
+class LStackSlot V8_FINAL : public LOperand {
  public:
   static LStackSlot* Create(int index, Zone* zone) {
     ASSERT(index >= 0);
@@ -378,7 +378,7 @@ class LStackSlot FINAL : public LOperand {
 };
 
 
-class LDoubleStackSlot FINAL : public LOperand {
+class LDoubleStackSlot V8_FINAL : public LOperand {
  public:
   static LDoubleStackSlot* Create(int index, Zone* zone) {
     ASSERT(index >= 0);
@@ -403,7 +403,7 @@ class LDoubleStackSlot FINAL : public LOperand {
 };
 
 
-class LRegister FINAL : public LOperand {
+class LRegister V8_FINAL : public LOperand {
  public:
   static LRegister* Create(int index, Zone* zone) {
     ASSERT(index >= 0);
@@ -428,7 +428,7 @@ class LRegister FINAL : public LOperand {
 };
 
 
-class LDoubleRegister FINAL : public LOperand {
+class LDoubleRegister V8_FINAL : public LOperand {
  public:
   static LDoubleRegister* Create(int index, Zone* zone) {
     ASSERT(index >= 0);
@@ -453,7 +453,7 @@ class LDoubleRegister FINAL : public LOperand {
 };
 
 
-class LParallelMove FINAL : public ZoneObject {
+class LParallelMove V8_FINAL : public ZoneObject {
  public:
   explicit LParallelMove(Zone* zone) : move_operands_(4, zone) { }
 
@@ -474,7 +474,7 @@ class LParallelMove FINAL : public ZoneObject {
 };
 
 
-class LPointerMap FINAL : public ZoneObject {
+class LPointerMap V8_FINAL : public ZoneObject {
  public:
   explicit LPointerMap(int position, Zone* zone)
       : pointer_operands_(8, zone),
@@ -510,7 +510,7 @@ class LPointerMap FINAL : public ZoneObject {
 };
 
 
-class LEnvironment FINAL : public ZoneObject {
+class LEnvironment V8_FINAL : public ZoneObject {
  public:
   LEnvironment(Handle<JSFunction> closure,
                FrameType frame_type,
@@ -655,7 +655,7 @@ class LEnvironment FINAL : public ZoneObject {
 
 
 // Iterates over the non-null, non-constant operands in an environment.
-class ShallowIterator FINAL BASE_EMBEDDED {
+class ShallowIterator V8_FINAL BASE_EMBEDDED {
  public:
   explicit ShallowIterator(LEnvironment* env)
       : env_(env),
@@ -699,7 +699,7 @@ class ShallowIterator FINAL BASE_EMBEDDED {
 
 
 // Iterator for non-null, non-constant operands incl. outer environments.
-class DeepIterator FINAL BASE_EMBEDDED {
+class DeepIterator V8_FINAL BASE_EMBEDDED {
  public:
   explicit DeepIterator(LEnvironment* env)
       : current_iterator_(env) {