[x86] Fix register constraints for multiply-high.

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

Index: test/unittests/compiler/instruction-selector-unittest.h
diff --git a/test/unittests/compiler/instruction-selector-unittest.h b/test/unittests/compiler/instruction-selector-unittest.h
index ee5f610ecd610fd8cbd8a0afe172d39a956fce46..4e498626723e104b6e5d06cd9a96835bb25138af 100644
--- a/test/unittests/compiler/instruction-selector-unittest.h
+++ b/test/unittests/compiler/instruction-selector-unittest.h
@@ -170,6 +170,9 @@ class InstructionSelectorTest : public TestWithContext, public TestWithZone {
 
     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];