fix uninitialized variable

R=ulan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/12566004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13861 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -215,7 +215,7 @@ static MaybeObject* GetPrimitiveValue(
     const PrimitiveValueDescriptor& descriptor,
     char* ptr,
     Heap* heap) {
-  int32_t int32_value;
+  int32_t int32_value = 0;
   switch (descriptor.data_type) {
     case kDescriptorInt8Type:
       int32_value = *CheckedCast<int8_t>(ptr);