Deoptimization fix for HPushArgument.

src/lithium.h

Index: src/lithium.h
diff --git a/src/lithium.h b/src/lithium.h
index 754f88da82184816de334a89daf09a86a55c1231..439479cb41e43df4398f9530910cfac0c9061f49 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -52,8 +52,7 @@ class LOperand : public ZoneObject {
     STACK_SLOT,
     DOUBLE_STACK_SLOT,
     REGISTER,
-    DOUBLE_REGISTER,
-    ARGUMENT
+    DOUBLE_REGISTER
   };
 
   LOperand() : value_(KindField::encode(INVALID)) { }
@@ -63,7 +62,6 @@ class LOperand : public ZoneObject {
 #define LITHIUM_OPERAND_PREDICATE(name, type) \
   bool Is##name() const { return kind() == type; }
   LITHIUM_OPERAND_LIST(LITHIUM_OPERAND_PREDICATE)
-  LITHIUM_OPERAND_PREDICATE(Argument, ARGUMENT)
   LITHIUM_OPERAND_PREDICATE(Unallocated, UNALLOCATED)
   LITHIUM_OPERAND_PREDICATE(Ignored, INVALID)
 #undef LITHIUM_OPERAND_PREDICATE
@@ -342,17 +340,6 @@ class LConstantOperand V8_FINAL : public LOperand {
 };
 
 
-class LArgument V8_FINAL : public LOperand {
- public:
-  explicit LArgument(int index) : LOperand(ARGUMENT, index) { }
-
-  static LArgument* cast(LOperand* op) {
-    ASSERT(op->IsArgument());
-    return reinterpret_cast<LArgument*>(op);
-  }
-};
-
-
 class LStackSlot V8_FINAL : public LOperand {
  public:
   static LStackSlot* Create(int index, Zone* zone) {
@@ -679,7 +666,7 @@ class ShallowIterator V8_FINAL BASE_EMBEDDED {
 
  private:
   bool ShouldSkip(LOperand* op) {
-    return op == NULL || op->IsConstantOperand() || op->IsArgument();
+    return op == NULL || op->IsConstantOperand();
   }
 
   // Skip until something interesting, beginning with and including current_.