PPC: Built-in apply() performance benefits from an uninitialized IC.

Port 2a3b0575

R=mvstanton@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1196253003

Cr-Commit-Position: refs/heads/master@{#29196}

src/ppc/builtins-ppc.cc

@@ -1427,6 +1427,8 @@ static void Generate_PushAppliedArguments(MacroAssembler* masm,
                                           const int limitOffset) {
   Register receiver = LoadDescriptor::ReceiverRegister();
   Register key = LoadDescriptor::NameRegister();
+  Register slot = LoadDescriptor::SlotRegister();
+  Register vector = LoadWithVectorDescriptor::VectorRegister();
 
   // Copy all arguments from the array to the stack.
   Label entry, loop;
@@ -1436,7 +1438,13 @@ static void Generate_PushAppliedArguments(MacroAssembler* masm,
   __ LoadP(receiver, MemOperand(fp, argumentsOffset));
 
   // Use inline caching to speed up access to arguments.
-  Handle<Code> ic = masm->isolate()->builtins()->KeyedLoadIC_Megamorphic();
+  FeedbackVectorSpec spec(0, Code::KEYED_LOAD_IC);
+  Handle<TypeFeedbackVector> feedback_vector =
+      masm->isolate()->factory()->NewTypeFeedbackVector(&spec);
+  int index = feedback_vector->GetIndex(FeedbackVectorICSlot(0));
+  __ LoadSmiLiteral(slot, Smi::FromInt(index));
+  __ Move(vector, feedback_vector);
+  Handle<Code> ic = KeyedLoadICStub(masm->isolate()).GetCode();
   __ Call(ic, RelocInfo::CODE_TARGET);
 
   // Push the nth argument.