Inline number to string conversion for string addition into BinaryOp(Stub).

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index beaf3206a6c1aff2e6fb72eaab8029a0358b73f1..fdab378ba1a4fe00a6a276edd03bd635323d7a33 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -70,7 +70,8 @@ void NumberToStringStub::InitializeInterfaceDescriptor(
   static Register registers[] = { eax };
   descriptor->register_param_count_ = 1;
   descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kNumberToString)->entry;
 }