Allow trace-codegen to dereference handles.

src/codegen.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.
 
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
 #include "src/cpu-profiler.h"
@@ skipping 98 matching lines @@
     ftype = "user-defined";
   }
 
   if (FLAG_trace_codegen || print_source || print_ast) {
     PrintF("[generating %s code for %s function: ", kind, ftype);
     if (info->IsStub()) {
       const char* name =
           CodeStub::MajorName(info->code_stub()->MajorKey(), true);
       PrintF("%s", name == NULL ? "<unknown>" : name);
     } else {
+      AllowDeferredHandleDereference allow_deference_for_trace;
       PrintF("%s", info->function()->debug_name()->ToCString().get());
     }
     PrintF("]\n");
   }
 
 #ifdef DEBUG
   if (!info->IsStub() && print_source) {
     PrintF("--- Source from AST ---\n%s\n",
            PrettyPrinter(info->zone()).PrintProgram(info->function()));
   }
@@ skipping 99 matching lines @@
     masm->positions_recorder()->RecordStatementPosition(pos);
     masm->positions_recorder()->RecordPosition(pos);
     if (right_here) {
       return masm->positions_recorder()->WriteRecordedPositions();
     }
   }
   return false;
 }
 
 } }  // namespace v8::internal