Fix constructor call of relocation lock.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/18020002

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15362 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -526,7 +526,7 @@ class ReachabilityAnalyzer BASE_EMBEDDED {
 
 
 void HGraph::Verify(bool do_full_verify) const {
-  Heap::RelocationLock(isolate()->heap());
+  Heap::RelocationLock relocation_lock(isolate()->heap());
   AllowHandleDereference allow_deref;
   AllowDeferredHandleDereference allow_deferred_deref;
   for (int i = 0; i < blocks_.length(); i++) {