Reland 21774: Generate KeyedLoadGeneric with Hydrogen

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index f3e2418ee61d2a0ce5286900be19c3dc88b61640..9368f0ffa43a658ecc820d61922ee1208c48e6f5 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -526,12 +526,9 @@ class KeyedLoadIC: public LoadIC {
 
   Handle<Code> LoadElementStub(Handle<JSObject> receiver);
 
-  virtual Handle<Code> megamorphic_stub() {
-    return isolate()->builtins()->KeyedLoadIC_Generic();
-  }
-  virtual Handle<Code> generic_stub() const {
-    return isolate()->builtins()->KeyedLoadIC_Generic();
-  }
+  virtual Handle<Code> megamorphic_stub();
+  virtual Handle<Code> generic_stub() const;
+
   virtual Handle<Code> slow_stub() const {
     return isolate()->builtins()->KeyedLoadIC_Slow();
   }