Merge up to 8597 to experimental/gc from the bleeding edge.

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
===================================================================
--- src/x64/lithium-codegen-x64.h	(revision 8618)
+++ src/x64/lithium-codegen-x64.h	(working copy)
@@ -94,7 +94,7 @@
   void DoDeferredNumberTagD(LNumberTagD* instr);
   void DoDeferredTaggedToI(LTaggedToI* instr);
   void DoDeferredMathAbsTaggedHeapNumber(LUnaryMathOperation* instr);
-  void DoDeferredStackCheck(LGoto* instr);
+  void DoDeferredStackCheck(LStackCheck* instr);
   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
   void DoDeferredLInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
@@ -215,9 +215,10 @@
 
   Register ToRegister(int index) const;
   XMMRegister ToDoubleRegister(int index) const;
-  Operand BuildExternalArrayOperand(LOperand* external_pointer,
-                                    LOperand* key,
-                                    ExternalArrayType array_type);
+  Operand BuildExternalArrayOperand(
+      LOperand* external_pointer,
+      LOperand* key,
+      JSObject::ElementsKind elements_kind);
 
   // Specific math operations - used from DoUnaryMathOperation.
   void EmitIntegerMathAbs(LUnaryMathOperation* instr);
@@ -246,10 +247,13 @@
   }
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
-  void EmitGoto(int block, LDeferredCode* deferred_stack_check = NULL);
+  void EmitGoto(int block);
   void EmitBranch(int left_block, int right_block, Condition cc);
   void EmitCmpI(LOperand* left, LOperand* right);
-  void EmitNumberUntagD(Register input, XMMRegister result, LEnvironment* env);
+  void EmitNumberUntagD(Register input,
+                        XMMRegister result,
+                        bool deoptimize_on_undefined,
+                        LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.
   // Returns the condition on which a final split to