[Interpreter] Ensure ToBoolean bytecodes are correctly emitted at the start of basic blocks

src/interpreter/bytecode-array-builder.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_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include <vector>
 
 #include "src/ast.h"
@@ skipping 174 matching lines @@
   BytecodeArrayBuilder& JumpIfUndefined(BytecodeLabel* label);
 
   BytecodeArrayBuilder& Throw();
   BytecodeArrayBuilder& Return();
 
   // Complex flow control.
   BytecodeArrayBuilder& ForInPrepare(Register receiver);
   BytecodeArrayBuilder& ForInNext(Register for_in_state, Register index);
   BytecodeArrayBuilder& ForInDone(Register for_in_state);
 
-  BytecodeArrayBuilder& EnterBlock();
-  BytecodeArrayBuilder& LeaveBlock();
-
   // Accessors
   Zone* zone() const { return zone_; }
 
  private:
   ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; }
   const ZoneVector<uint8_t>* bytecodes() const { return &bytecodes_; }
   Isolate* isolate() const { return isolate_; }
 
   static Bytecode BytecodeForBinaryOperation(Token::Value op);
   static Bytecode BytecodeForCountOperation(Token::Value op);
@@ skipping 23 matching lines @@
               uint32_t operand2);
   void Output(Bytecode bytecode, uint32_t operand0, uint32_t operand1);
   void Output(Bytecode bytecode, uint32_t operand0);
   void Output(Bytecode bytecode);
 
   BytecodeArrayBuilder& OutputJump(Bytecode jump_bytecode,
                                    BytecodeLabel* label);
   void PatchJump(const ZoneVector<uint8_t>::iterator& jump_target,
                  ZoneVector<uint8_t>::iterator jump_location);
 
+  void LeaveBasicBlock();
   void EnsureReturn();
 
   bool OperandIsValid(Bytecode bytecode, int operand_index,
                       uint32_t operand_value) const;
   bool LastBytecodeInSameBlock() const;
 
   bool NeedToBooleanCast();
 
   int BorrowTemporaryRegister();
   void ReturnTemporaryRegister(int reg_index);
@@ skipping 93 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope);
 };
 
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_