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

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index af5f87d47645bf38ea7d26a0707402e44ca50e4b..a50511c02c817f21378e6c7718f2a0beb46d6666 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -66,7 +66,8 @@ void NumberToStringStub::InitializeInterfaceDescriptor(
   static Register registers[] = { a0 };
   descriptor->register_param_count_ = 1;
   descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kNumberToString)->entry;
 }