MIPS: port Fix ClassOf check on ARM.

Ported r8713 (6bdadc4)

BUG=
TEST=

Review URL: http://codereview.chromium.org/7564003
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8802 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/full-codegen-mips.cc

@@ -2761,7 +2761,7 @@ void FullCodeGenerator::EmitClassOf(ZoneList<Expression*>* args) {
 
   // Objects with a non-function constructor have class 'Object'.
   __ bind(&non_function_constructor);
-  __ LoadRoot(v0, Heap::kfunction_class_symbolRootIndex);
+  __ LoadRoot(v0, Heap::kObject_symbolRootIndex);
   __ jmp(&done);
 
   // Non-JS objects have class null.