[x86] Fix register constraints for multiply-high.

test/unittests/compiler/instruction-selector-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_SELECTOR_UNITTEST_H_
 #define V8_UNITTESTS_COMPILER_INSTRUCTION_SELECTOR_UNITTEST_H_
 
 #include <deque>
 #include <set>
 
@@ skipping 152 matching lines @@
     }
 
     int ToVreg(const InstructionOperand* operand) const {
       if (operand->IsConstant()) return operand->index();
       EXPECT_EQ(InstructionOperand::UNALLOCATED, operand->kind());
       return UnallocatedOperand::cast(operand)->virtual_register();
     }
 
     int ToVreg(const Node* node) const;
 
+    bool IsFixed(const InstructionOperand* operand, Register reg) const;
+    bool IsUsedAtStart(const InstructionOperand* operand) const;
+
     FrameStateDescriptor* GetFrameStateDescriptor(int deoptimization_id) {
       EXPECT_LT(deoptimization_id, GetFrameStateDescriptorCount());
       return deoptimization_entries_[deoptimization_id];
     }
 
     int GetFrameStateDescriptorCount() {
       return static_cast<int>(deoptimization_entries_.size());
     }
 
    private:
@@ skipping 44 matching lines @@
 template <typename T>
 class InstructionSelectorTestWithParam
     : public InstructionSelectorTest,
       public ::testing::WithParamInterface<T> {};
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UNITTESTS_COMPILER_INSTRUCTION_SELECTOR_UNITTEST_H_