Addresses some performance regression in the GenericBinaryOpStub on ARM followin...

src/arm/code-stubs-arm.h

Index: src/arm/code-stubs-arm.h
===================================================================
--- src/arm/code-stubs-arm.h	(revision 6012)
+++ src/arm/code-stubs-arm.h	(working copy)
@@ -77,7 +77,7 @@
         rhs_(rhs),
         constant_rhs_(constant_rhs),
         specialized_on_rhs_(RhsIsOneWeWantToOptimizeFor(op, constant_rhs)),
-        runtime_operands_type_(BinaryOpIC::DEFAULT),
+        runtime_operands_type_(BinaryOpIC::UNINIT_OR_SMI),
         name_(NULL) { }
 
   GenericBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info)
@@ -178,6 +178,10 @@
     return lhs_is_r0 ? r1 : r0;
   }
 
+  bool HasSmiSmiFastPath() {
+    return op_ != Token::DIV;
+  }
+
   bool ShouldGenerateSmiCode() {
     return ((op_ != Token::DIV && op_ != Token::MOD) || specialized_on_rhs_) &&
         runtime_operands_type_ != BinaryOpIC::HEAP_NUMBERS &&