[Interpreter] Move context chain search loop to handler

test/unittests/interpreter/bytecode-peephole-optimizer-unittest.cc

 // Copyright 2016 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.
 
 #include "src/v8.h"
 
 #include "src/factory.h"
 #include "src/interpreter/bytecode-label.h"
 #include "src/interpreter/bytecode-peephole-optimizer.h"
 #include "src/objects-inl.h"
@@ skipping 380 matching lines @@
   CHECK_EQ(write_count(), 2);
   CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
   CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
   Flush();
   CHECK_EQ(last_written().bytecode(), third.bytecode());
 }
 
 TEST_F(BytecodePeepholeOptimizerTest, MergeLdaContextSlotStar) {
   const uint32_t operands[] = {
       static_cast<uint32_t>(Register(200000).ToOperand()), 55005500,
+      static_cast<uint32_t>(Register(0).ToOperand()),
       static_cast<uint32_t>(Register(1).ToOperand())};
   const int expected_operand_count = static_cast<int>(arraysize(operands));
 
-  BytecodeNode first(Bytecode::kLdaContextSlot, operands[0], operands[1]);
-  BytecodeNode second(Bytecode::kStar, operands[2]);
+  BytecodeNode first(Bytecode::kLdaContextSlot, operands[0], operands[1],
+                     operands[2]);
+  BytecodeNode second(Bytecode::kStar, operands[3]);
   BytecodeNode third(Bytecode::kReturn);
   optimizer()->Write(&first);
   optimizer()->Write(&second);
   CHECK_EQ(write_count(), 1);
   CHECK_EQ(last_written().bytecode(), Bytecode::kLdrContextSlot);
   CHECK_EQ(last_written().operand_count(), expected_operand_count);
   for (int i = 0; i < expected_operand_count; ++i) {
     CHECK_EQ(last_written().operand(i), operands[i]);
   }
   optimizer()->Write(&third);
@@ skipping 106 matching lines @@
     CHECK_EQ(last_written().operand(0), 0);
     CHECK_EQ(last_written().operand(1), reg_operand);
     CHECK_EQ(last_written().operand(2), idx_operand);
     Reset();
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8