[strong] Disallow implicit conversions for comparison

src/x64/lithium-x64.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_X64_LITHIUM_X64_H_
 #define V8_X64_LITHIUM_X64_H_
 
 #include "src/hydrogen.h"
 #include "src/lithium.h"
 #include "src/lithium-allocator.h"
@@ skipping 1155 matching lines @@
     inputs_[2] = right;
   }
 
   LOperand* context() { return inputs_[0]; }
   LOperand* left() { return inputs_[1]; }
   LOperand* right() { return inputs_[2]; }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpT, "cmp-t")
   DECLARE_HYDROGEN_ACCESSOR(CompareGeneric)
 
+  LanguageMode language_mode() { return hydrogen()->language_mode(); }
+
   Token::Value op() const { return hydrogen()->token(); }
 };
 
 
 class LInstanceOf final : public LTemplateInstruction<1, 3, 0> {
  public:
   LInstanceOf(LOperand* context, LOperand* left, LOperand* right) {
     inputs_[0] = context;
     inputs_[1] = left;
     inputs_[2] = right;
@@ skipping 1669 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_