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

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index ac1315686593995a011d8951945ed8ed3ec2d3cb..e0d0ac6a0ba35283c9e4f85e0362a63c9aafae86 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -1406,6 +1406,8 @@ static void Generate_PushAppliedArguments(MacroAssembler* masm,
   Label entry, loop;
   Register receiver = LoadDescriptor::ReceiverRegister();
   Register key = LoadDescriptor::NameRegister();
+  Register slot = LoadDescriptor::SlotRegister();
+  Register vector = LoadWithVectorDescriptor::VectorRegister();
 
   __ ld(key, MemOperand(fp, indexOffset));
   __ Branch(&entry);
@@ -1415,7 +1417,13 @@ static void Generate_PushAppliedArguments(MacroAssembler* masm,
   __ ld(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));
+  __ li(slot, Operand(Smi::FromInt(index)));
+  __ li(vector, feedback_vector);
+  Handle<Code> ic = KeyedLoadICStub(masm->isolate()).GetCode();
   __ Call(ic, RelocInfo::CODE_TARGET);
 
   __ push(v0);