CodeStubs contain their corresponding Isolate* now. (part 2)

test/cctest/test-code-stubs-ia32.cc

Index: test/cctest/test-code-stubs-ia32.cc
diff --git a/test/cctest/test-code-stubs-ia32.cc b/test/cctest/test-code-stubs-ia32.cc
index e07f21b82e5da5532b137eb52e8b7d8930bdb9ee..96639577b46aef5b1c27cfd981ef4147751c77cf 100644
--- a/test/cctest/test-code-stubs-ia32.cc
+++ b/test/cctest/test-code-stubs-ia32.cc
@@ -56,7 +56,7 @@ ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
   int offset =
     source_reg.is(esp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
   DoubleToIStub stub(isolate, source_reg, destination_reg, offset, true);
-  byte* start = stub.GetCode(isolate)->instruction_start();
+  byte* start = stub.GetCode()->instruction_start();
 
   __ push(ebx);
   __ push(ecx);