[turbofan] remove one level of indirection in phi inputs

test/unittests/compiler/instruction-sequence-unittest.h

 // Copyright 2014 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_UNITTESTS_COMPILER_INSTRUCTION_SEQUENCE_UNITTEST_H_
 #define V8_UNITTESTS_COMPILER_INSTRUCTION_SEQUENCE_UNITTEST_H_
 
 #include "src/compiler/instruction.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 120 matching lines @@
   VReg Define(TestOperand output_op);
   VReg Parameter(TestOperand output_op = Reg()) { return Define(output_op); }
 
   int Return(TestOperand input_op_0);
   int Return(VReg vreg) { return Return(Reg(vreg, 0)); }
 
   PhiInstruction* Phi(VReg incoming_vreg_0 = VReg(),
                       VReg incoming_vreg_1 = VReg(),
                       VReg incoming_vreg_2 = VReg(),
                       VReg incoming_vreg_3 = VReg());
-  void Extend(PhiInstruction* phi, VReg vreg);
+  PhiInstruction* Phi(VReg incoming_vreg_0, size_t input_count);
+  void SetInput(PhiInstruction* phi, size_t input, VReg vreg);
 
   VReg DefineConstant(int32_t imm = 0);
   int EmitNop();
   int EmitI(size_t input_size, TestOperand* inputs);
   int EmitI(TestOperand input_op_0 = TestOperand(),
             TestOperand input_op_1 = TestOperand(),
             TestOperand input_op_2 = TestOperand(),
             TestOperand input_op_3 = TestOperand());
   VReg EmitOI(TestOperand output_op, size_t input_size, TestOperand* inputs);
   VReg EmitOI(TestOperand output_op, TestOperand input_op_0 = TestOperand(),
@@ skipping 78 matching lines @@
   LoopBlocks loop_blocks_;
   InstructionBlock* current_block_;
   bool block_returns_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UNITTESTS_COMPILER_INSTRUCTION_SEQUENCE_UNITTEST_H_