Consolidated all the key store/load classes in the Hydrogen and Lithium

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
diff --git a/src/x64/lithium-codegen-x64.h b/src/x64/lithium-codegen-x64.h
index 65b39801636ead85ccb543ea922ad48851376e85..a9101d17c74279df73e6058e0d80ccc0cc3c0ff7 100644
--- a/src/x64/lithium-codegen-x64.h
+++ b/src/x64/lithium-codegen-x64.h
@@ -335,6 +335,12 @@ class LCodeGen BASE_EMBEDDED {
   };
 
   void EnsureSpaceForLazyDeopt(int space_needed);
+  void DoLoadKeyedExternal(LLoadKeyed* instr);
+  void DoLoadKeyedDouble(LLoadKeyed* instr);
+  void DoLoadKeyedFixed(LLoadKeyed* instr);
+  void DoStoreKeyedExternal(LStoreKeyed* instr);
+  void DoStoreKeyedDouble(LStoreKeyed* instr);
+  void DoStoreKeyedFixed(LStoreKeyed* instr);
 
   Zone* zone_;
   LPlatformChunk* const chunk_;