Implement ICs for FastDoubleArray loads and stores

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 93c50fa988f285ce07f64863c92fd844b0fbef14..ffe4241ec14c2a35028f714839a236b676c447b4 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -662,6 +662,8 @@ class KeyedLoadStubCompiler: public StubCompiler {
 
   static void GenerateLoadFastElement(MacroAssembler* masm);
 
+  static void GenerateLoadFastDoubleElement(MacroAssembler* masm);
+
   static void GenerateLoadDictionaryElement(MacroAssembler* masm);
 
  private:
@@ -717,6 +719,9 @@ class KeyedStoreStubCompiler: public StubCompiler {
   static void GenerateStoreFastElement(MacroAssembler* masm,
                                        bool is_js_array);
 
+  static void GenerateStoreFastDoubleElement(MacroAssembler* masm,
+                                             bool is_js_array);
+
   static void GenerateStoreExternalArray(MacroAssembler* masm,
                                          JSObject::ElementsKind elements_kind);