Subzero: Fix a mul lowering error.

src/IceTargetLoweringARM32.h

 //===- subzero/src/IceTargetLoweringARM32.h - ARM32 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 745 matching lines @@
   void _udiv(Variable *Dest, Variable *Src0, Variable *Src1,
              CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert<InstARM32Udiv>(Dest, Src0, Src1, Pred);
   }
   void _umull(Variable *DestLo, Variable *DestHi, Variable *Src0,
               Variable *Src1, CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert<InstARM32Umull>(DestLo, DestHi, Src0, Src1, Pred);
     // Model the modification to the second dest as a fake def. Note that the
     // def is not predicated.
     Context.insert<InstFakeDef>(DestHi, DestLo);
+    Context.insert<InstFakeUse>(DestHi);
   }
   void _uxt(Variable *Dest, Variable *Src0,
             CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert<InstARM32Uxt>(Dest, Src0, Pred);
   }
   void _vabs(Variable *Dest, Variable *Src,
              CondARM32::Cond Pred = CondARM32::AL) {
     Context.insert<InstARM32Vabs>(Dest, Src, Pred);
   }
   void _vadd(Variable *Dest, Variable *Src0, Variable *Src1) {
@@ skipping 440 matching lines @@
 private:
   ~TargetHeaderARM32() = default;
 
   TargetARM32Features CPUFeatures;
 };
 
 } // end of namespace ARM32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H