[stubs] Introduce AddStub and SubtractStub.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index b5eaef8b846d281c2423e8a55179c3be71507603..4cc58a164fd9b20d11e0ea1c3c23343a7912f506 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -649,7 +649,7 @@ void Interpreter::DoBinaryOp(Runtime::FunctionId function_id,
 //
 // Add register <src> to accumulator.
 void Interpreter::DoAdd(InterpreterAssembler* assembler) {
-  DoBinaryOp(Runtime::kAdd, assembler);
+  DoBinaryOp(CodeFactory::Add(isolate_), assembler);
 }
 
 
@@ -657,7 +657,7 @@ void Interpreter::DoAdd(InterpreterAssembler* assembler) {
 //
 // Subtract register <src> from accumulator.
 void Interpreter::DoSub(InterpreterAssembler* assembler) {
-  DoBinaryOp(Runtime::kSubtract, assembler);
+  DoBinaryOp(CodeFactory::Subtract(isolate_), assembler);
 }