Removed static type inference and add a dynamic test for string addition.

src/arm/virtual-frame-arm.h

Index: src/arm/virtual-frame-arm.h
diff --git a/src/arm/virtual-frame-arm.h b/src/arm/virtual-frame-arm.h
index ebebd534a764bb15e9f2ab12976bae59240b3720..2f36f108bba2fbf709467ae0dadb417c8caac36c 100644
--- a/src/arm/virtual-frame-arm.h
+++ b/src/arm/virtual-frame-arm.h
@@ -359,14 +359,14 @@ class VirtualFrame : public ZoneObject {
   void EmitPush(Register reg);
 
   // Push an element on the virtual frame.
-  void Push(Register reg, StaticType static_type = StaticType());
+  void Push(Register reg);
   void Push(Handle<Object> value);
   void Push(Smi* value) { Push(Handle<Object>(value)); }
 
   // Pushing a result invalidates it (its contents become owned by the frame).
   void Push(Result* result) {
     if (result->is_register()) {
-      Push(result->reg(), result->static_type());
+      Push(result->reg());
     } else {
       ASSERT(result->is_constant());
       Push(result->handle());