Use a reserved stack local variable to store the Code object so that it can be looked up easily whe…

vm/debugger.cc

Index: vm/debugger.cc
===================================================================
--- vm/debugger.cc	(revision 7576)
+++ vm/debugger.cc	(working copy)
@@ -102,7 +102,7 @@
   if (function_.IsNull()) {
     Isolate* isolate = Isolate::Current();
     ASSERT(isolate != NULL);
-    const Code& code = Code::Handle(StackFrame::LookupCode(isolate, pc_));
+    const Code& code = Code::Handle(Code::LookupCode(pc_));
     function_ = code.function();
   }
   return function_;