Removed static type inference and add a dynamic test for string addition.

src/register-allocator.cc

 // Copyright 2009 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 22 matching lines @@
 namespace v8 {
 namespace internal {
 
 // -------------------------------------------------------------------------
 // Result implementation.
 
 
 Result::Result(Register reg) {
   ASSERT(reg.is_valid() && !RegisterAllocator::IsReserved(reg));
   CodeGeneratorScope::Current()->allocator()->Use(reg);
-  value_ = StaticTypeField::encode(StaticType::UNKNOWN_TYPE)
-      | TypeField::encode(REGISTER)
-      | DataField::encode(reg.code_);
+  value_ = TypeField::encode(REGISTER) | DataField::encode(reg.code_);
 }
 
 
-Result::Result(Register reg, StaticType type) {
-  ASSERT(reg.is_valid() && !RegisterAllocator::IsReserved(reg));
-  CodeGeneratorScope::Current()->allocator()->Use(reg);
-  value_ = StaticTypeField::encode(type.static_type_)
-      | TypeField::encode(REGISTER)
-      | DataField::encode(reg.code_);
-}
-
-
 // -------------------------------------------------------------------------
 // RegisterAllocator implementation.
 
 
 Result RegisterAllocator::AllocateWithoutSpilling() {
   // Return the first free register, if any.
   int num = registers_.ScanForFreeRegister();
   if (num == RegisterAllocator::kInvalidRegister) {
     return Result();
   }
@@ skipping 28 matching lines @@
     cgen_->frame()->Spill(target);
     ASSERT(!is_used(target));
     return Result(target);
   }
   // Otherwise (if it's referenced outside the frame) we cannot allocate it.
   return Result();
 }
 
 
 } }  // namespace v8::internal