Use 0 instead of undefined for uninitialized stub key.

The CPU profiler looks at uninitialized code objects, which triggers an assertion.

TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/404113003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22507 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/factory.cc

@@ -1437,7 +1437,7 @@ Handle<Code> Factory::NewCode(const CodeDesc& desc,
   code->set_raw_kind_specific_flags2(0);
   code->set_is_crankshafted(crankshafted);
   code->set_deoptimization_data(*empty_fixed_array(), SKIP_WRITE_BARRIER);
-  code->set_raw_type_feedback_info(*undefined_value());
+  code->set_raw_type_feedback_info(Smi::FromInt(0));
   code->set_next_code_link(*undefined_value());
   code->set_handler_table(*empty_fixed_array(), SKIP_WRITE_BARRIER);
   code->set_prologue_offset(prologue_offset);

src/objects-debug.cc

@@ -639,7 +639,7 @@ void Code::CodeVerify() {
       last_gc_pc = it.rinfo()->pc();
     }
   }
-  CHECK(raw_type_feedback_info()->IsUndefined() ||
+  CHECK(raw_type_feedback_info() == Smi::FromInt(0) ||
         raw_type_feedback_info()->IsSmi() == IsCodeStubOrIC());
 }