Merge bleeding edge up to 8774 into the GC branch.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h	(revision 8778)
+++ src/x64/lithium-x64.h	(working copy)
@@ -121,6 +121,7 @@
   V(LoadFunctionPrototype)                      \
   V(LoadGlobalCell)                             \
   V(LoadGlobalGeneric)                          \
+  V(LoadKeyedFastDoubleElement)                 \
   V(LoadKeyedFastElement)                       \
   V(LoadKeyedGeneric)                           \
   V(LoadKeyedSpecializedArrayElement)           \
@@ -147,6 +148,7 @@
   V(StoreContextSlot)                           \
   V(StoreGlobalCell)                            \
   V(StoreGlobalGeneric)                         \
+  V(StoreKeyedFastDoubleElement)                \
   V(StoreKeyedFastElement)                      \
   V(StoreKeyedGeneric)                          \
   V(StoreKeyedSpecializedArrayElement)          \
@@ -1134,6 +1136,22 @@
 };
 
 
+class LLoadKeyedFastDoubleElement: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LLoadKeyedFastDoubleElement(LOperand* elements, LOperand* key) {
+    inputs_[0] = elements;
+    inputs_[1] = key;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadKeyedFastDoubleElement,
+                               "load-keyed-fast-double-element")
+  DECLARE_HYDROGEN_ACCESSOR(LoadKeyedFastDoubleElement)
+
+  LOperand* elements() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+};
+
+
 class LLoadKeyedSpecializedArrayElement: public LTemplateInstruction<1, 2, 0> {
  public:
   LLoadKeyedSpecializedArrayElement(LOperand* external_pointer,
@@ -1586,6 +1604,28 @@
 };
 
 
+class LStoreKeyedFastDoubleElement: public LTemplateInstruction<0, 3, 0> {
+ public:
+  LStoreKeyedFastDoubleElement(LOperand* elements,
+                               LOperand* key,
+                               LOperand* val) {
+    inputs_[0] = elements;
+    inputs_[1] = key;
+    inputs_[2] = val;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StoreKeyedFastDoubleElement,
+                               "store-keyed-fast-double-element")
+  DECLARE_HYDROGEN_ACCESSOR(StoreKeyedFastDoubleElement)
+
+  virtual void PrintDataTo(StringStream* stream);
+
+  LOperand* elements() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+  LOperand* value() { return inputs_[2]; }
+};
+
+
 class LStoreKeyedSpecializedArrayElement: public LTemplateInstruction<0, 3, 0> {
  public:
   LStoreKeyedSpecializedArrayElement(LOperand* external_pointer,