Make "typeof this" return object in fast compiler.

src/arm/fast-codegen-arm.cc

Index: src/arm/fast-codegen-arm.cc
===================================================================
--- src/arm/fast-codegen-arm.cc	(revision 3225)
+++ src/arm/fast-codegen-arm.cc	(working copy)
@@ -1031,7 +1031,9 @@
       ASSERT_EQ(Expression::kValue, expr->expression()->context());
 
       VariableProxy* proxy = expr->expression()->AsVariableProxy();
-      if (proxy != NULL && proxy->var()->is_global()) {
+      if (proxy != NULL &&
+          !proxy->var()->is_this() &&
+          proxy->var()->is_global()) {
         Comment cmnt(masm_, "Global variable");
         __ ldr(r0, CodeGenerator::GlobalObject());
         __ push(r0);