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diff --git a/deps/v8/src/crankshaft/x87/lithium-gap-resolver-x87.h b/deps/v8/src/crankshaft/x87/lithium-gap-resolver-x87.h
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+// Copyright 2011 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_CRANKSHAFT_X87_LITHIUM_GAP_RESOLVER_X87_H_
+#define V8_CRANKSHAFT_X87_LITHIUM_GAP_RESOLVER_X87_H_
+
+#include "src/crankshaft/lithium.h"
+
+namespace v8 {
+namespace internal {
+
+class LCodeGen;
+class LGapResolver;
+
+class LGapResolver final BASE_EMBEDDED {
+ public:
+  explicit LGapResolver(LCodeGen* owner);
+
+  // Resolve a set of parallel moves, emitting assembler instructions.
+  void Resolve(LParallelMove* parallel_move);
+
+ private:
+  // Build the initial list of moves.
+  void BuildInitialMoveList(LParallelMove* parallel_move);
+
+  // Perform the move at the moves_ index in question (possibly requiring
+  // other moves to satisfy dependencies).
+  void PerformMove(int index);
+
+  // Emit any code necessary at the end of a gap move.
+  void Finish();
+
+  // Add or delete a move from the move graph without emitting any code.
+  // Used to build up the graph and remove trivial moves.
+  void AddMove(LMoveOperands move);
+  void RemoveMove(int index);
+
+  // Report the count of uses of operand as a source in a not-yet-performed
+  // move.  Used to rebuild use counts.
+  int CountSourceUses(LOperand* operand);
+
+  // Emit a move and remove it from the move graph.
+  void EmitMove(int index);
+
+  // Execute a move by emitting a swap of two operands.  The move from
+  // source to destination is removed from the move graph.
+  void EmitSwap(int index);
+
+  // Ensure that the given operand is not spilled.
+  void EnsureRestored(LOperand* operand);
+
+  // Return a register that can be used as a temp register, spilling
+  // something if necessary.
+  Register EnsureTempRegister();
+
+  // Return a known free register different from the given one (which could
+  // be no_reg---returning any free register), or no_reg if there is no such
+  // register.
+  Register GetFreeRegisterNot(Register reg);
+
+  // Verify that the state is the initial one, ready to resolve a single
+  // parallel move.
+  bool HasBeenReset();
+
+  // Verify the move list before performing moves.
+  void Verify();
+
+  LCodeGen* cgen_;
+
+  // List of moves not yet resolved.
+  ZoneList<LMoveOperands> moves_;
+
+  // Source and destination use counts for the general purpose registers.
+  int source_uses_[Register::kNumRegisters];
+  int destination_uses_[DoubleRegister::kMaxNumRegisters];
+
+  // If we had to spill on demand, the currently spilled register's
+  // allocation index.
+  int spilled_register_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CRANKSHAFT_X87_LITHIUM_GAP_RESOLVER_X87_H_