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

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index e39753d8e72bec33b7724e6b805b325d16e5e0dd..3af356ca650ddd38b76ffcb7358cd8b24416bfa4 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.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();
-  __ ld(receiver, GlobalObjectOperand());
-  __ ld(receiver, FieldMemOperand(receiver, GlobalObject::kBuiltinsOffset));
-  __ push(receiver);
+  // Push undefined as the receiver.
+  __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
+  __ push(v0);
 
-  // Load the function from the receiver.
-  __ li(LoadDescriptor::NameRegister(), Operand(expr->name()));
-  __ li(LoadDescriptor::SlotRegister(),
-        Operand(SmiFromSlot(expr->CallRuntimeFeedbackSlot())));
-  CallLoadIC(NOT_INSIDE_TYPEOF);
+  __ ld(v0, GlobalObjectOperand());
+  __ ld(v0, FieldMemOperand(v0, GlobalObject::kNativeContextOffset));
+  __ ld(v0, ContextOperand(v0, expr->context_index()));
 }