* String type inference using compiler framework.

src/builtins.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 106 matching lines @@
   V(SHR, 1)                    \
   V(DELETE, 1)                 \
   V(IN, 1)                     \
   V(INSTANCE_OF, 1)            \
   V(GET_KEYS, 0)               \
   V(FILTER_KEY, 1)             \
   V(CALL_NON_FUNCTION, 0)      \
   V(TO_OBJECT, 0)              \
   V(TO_NUMBER, 0)              \
   V(TO_STRING, 0)              \
+  V(STRING_ADD_LEFT, 1)        \
+  V(STRING_ADD_RIGHT, 1)       \
   V(APPLY_PREPARE, 1)          \
   V(APPLY_OVERFLOW, 1)
 
 
 class ObjectVisitor;
 
 
 class Builtins : public AllStatic {
  public:
   // Generate all builtin code objects. Should be called once during
@@ skipping 71 matching lines @@
   static void Generate_JSConstructEntryTrampoline(MacroAssembler* masm);
   static void Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm);
 
   static void Generate_FunctionCall(MacroAssembler* masm);
   static void Generate_FunctionApply(MacroAssembler* masm);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_BUILTINS_H_