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

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 4538 matching lines @@
   ExternalReference debug_is_active =
       ExternalReference::debug_is_active_address(isolate());
   __ mov(ip, Operand(debug_is_active));
   __ lbz(r3, MemOperand(ip));
   __ SmiTag(r3);
   context()->Plug(r3);
 }
 
 
 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()));
 }
 
 
 void FullCodeGenerator::EmitCallJSRuntimeFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
 
   SetCallPosition(expr, arg_count);
   CallFunctionStub stub(isolate(), arg_count, NO_CALL_FUNCTION_FLAGS);
   __ LoadP(r4, MemOperand(sp, (arg_count + 1) * kPointerSize), r0);
@@ skipping 809 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_PPC