Perform string add in generated code on IA-32 platforms...

src/code-stubs.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 18 matching lines @@
 #define V8_CODE_STUBS_H_
 
 namespace v8 {
 namespace internal {
 
 // List of code stubs used on all platforms. The order in this list is important
 // as only the stubs up to and including RecordWrite allows nested stub calls.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)  \
   V(CallFunction)                        \
   V(GenericBinaryOp)                     \
+  V(StringAdd)                           \
   V(SmiOp)                               \
   V(Compare)                             \
   V(RecordWrite)                         \
   V(ConvertToDouble)                     \
   V(WriteInt32ToHeapNumber)              \
   V(StackCheck)                          \
   V(UnarySub)                            \
   V(RevertToNumber)                      \
   V(ToBoolean)                           \
   V(Instanceof)                          \
@@ skipping 83 matching lines @@
 
   class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};
   class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};
 
   friend class BreakPointIterator;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_