[Interpreter] Don't try to eliminate dead-code in bytecode-array-builder

src/interpreter/bytecode-peephole-optimizer.h

 // Copyright 2015 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_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_
 #define V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_
 
 #include "src/interpreter/bytecode-pipeline.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 class ConstantArrayBuilder;
 
 // An optimization stage for performing peephole optimizations on
 // generated bytecode. The optimizer may buffer one bytecode
 // internally.
 class BytecodePeepholeOptimizer final : public BytecodePipelineStage,
                                         public ZoneObject {
  public:
   BytecodePeepholeOptimizer(ConstantArrayBuilder* constant_array_builder,
                             BytecodePipelineStage* next_stage);
 
+  // BytecodePipelineStage interface.
   void Write(BytecodeNode* node) override;
   size_t FlushForOffset() override;
   void FlushBasicBlock() override;
 
  private:
   BytecodeNode* Optimize(BytecodeNode* current);
 
   void TryToRemoveLastExpressionPosition(const BytecodeNode* const current);
   bool TransformLastAndCurrentBytecodes(BytecodeNode* const current);
   bool CanElideCurrent(const BytecodeNode* const current) const;
@@ skipping 21 matching lines @@
   bool last_is_discardable_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodePeepholeOptimizer);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_