[stubs] Refactor StringCompareStub and use it for HStringCompareAndBranch.

src/ia32/lithium-ia32.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_IA32_LITHIUM_IA32_H_
 #define V8_IA32_LITHIUM_IA32_H_
 
 #include "src/hydrogen.h"
 #include "src/lithium.h"
 #include "src/lithium-allocator.h"
@@ skipping 1037 matching lines @@
 
 
 class LStringCompareAndBranch final : public LControlInstruction<3, 0> {
  public:
   LStringCompareAndBranch(LOperand* context, LOperand* left, LOperand* right) {
     inputs_[0] = context;
     inputs_[1] = left;
     inputs_[2] = right;
   }
 
-  LOperand* context() { return inputs_[1]; }
+  LOperand* context() { return inputs_[0]; }
   LOperand* left() { return inputs_[1]; }
   LOperand* right() { return inputs_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch,
                                "string-compare-and-branch")
   DECLARE_HYDROGEN_ACCESSOR(StringCompareAndBranch)
 
   void PrintDataTo(StringStream* stream) override;
 
   Token::Value op() const { return hydrogen()->token(); }
@@ skipping 1812 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_IA32_H_