Call JS functions via native context instead of js builtins object.

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 60ac0b58b5b00d79525f6c2964738609c5f14d22..9fd6aff785ab562cda18686083ac10b62850c932 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -4556,17 +4556,13 @@ void FullCodeGenerator::EmitDebugIsActive(CallRuntime* expr) {
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
-  // Push the builtins object as the receiver.
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  __ LoadP(receiver, GlobalObjectOperand());
-  __ LoadP(receiver, FieldMemOperand(receiver, GlobalObject::kBuiltinsOffset));
-  __ push(receiver);
+  // Push undefined as the receiver.
+  __ LoadRoot(r3, Heap::kUndefinedValueRootIndex);
+  __ push(r3);
 
-  // Load the function from the receiver.
-  __ mov(LoadDescriptor::NameRegister(), Operand(expr->name()));
-  __ mov(LoadDescriptor::SlotRegister(),
-         Operand(SmiFromSlot(expr->CallRuntimeFeedbackSlot())));
-  CallLoadIC(NOT_INSIDE_TYPEOF);
+  __ LoadP(r3, GlobalObjectOperand());
+  __ LoadP(r3, FieldMemOperand(r3, GlobalObject::kNativeContextOffset));
+  __ LoadP(r3, ContextOperand(r3, expr->context_index()));
 }