Remove unused variable to please Clang.

Review URL: http://codereview.chromium.org/5151010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5861 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/stub-cache-ia32.cc

@@ -1141,7 +1141,6 @@ void StubCompiler::GenerateLoadConstant(JSObject* object,
   __ j(zero, miss, not_taken);
 
   // Check that the maps haven't changed.
-  Register reg =
   CheckPrototypes(object, receiver, holder,
                   scratch1, scratch2, scratch3, name, miss);