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

src/full-codegen/ia32/full-codegen-ia32.cc

 // Copyright 2012 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_IA32
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 4451 matching lines @@
   DCHECK(expr->arguments()->length() == 0);
   ExternalReference debug_is_active =
       ExternalReference::debug_is_active_address(isolate());
   __ movzx_b(eax, Operand::StaticVariable(debug_is_active));
   __ SmiTag(eax);
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
-  // Push the builtins object as receiver.
+  // Push undefined as receiver.
+  __ push(Immediate(isolate()->factory()->undefined_value()));
+
   __ mov(eax, GlobalObjectOperand());
-  __ push(FieldOperand(eax, GlobalObject::kBuiltinsOffset));
-
-  // Load the function from the receiver.
-  __ mov(LoadDescriptor::ReceiverRegister(), Operand(esp, 0));
-  __ mov(LoadDescriptor::NameRegister(), Immediate(expr->name()));
-  __ mov(LoadDescriptor::SlotRegister(),
-         Immediate(SmiFromSlot(expr->CallRuntimeFeedbackSlot())));
-  CallLoadIC(NOT_INSIDE_TYPEOF);
+  __ mov(eax, FieldOperand(eax, GlobalObject::kNativeContextOffset));
+  __ mov(eax, ContextOperand(eax, 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);
   __ mov(edi, Operand(esp, (arg_count + 1) * kPointerSize));
@@ skipping 799 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32