[wasm] Fixed register allocation for Word32PairShl on arm.

src/compiler/arm/instruction-selector-arm.cc

 // 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.
 
 #include "src/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 767 matching lines @@
 
   InstructionOperand outputs[] = {
       g.DefineAsRegister(node),
       g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
   Emit(kArmAddPair, 2, outputs, 4, inputs);
 }
 
 void InstructionSelector::VisitWord32PairShl(Node* node) {
   ArmOperandGenerator g(this);
+  // We use g.UseUniqueRegister here for InputAt(0) to guarantee that there is
+  // no register aliasing with output registers.
   Int32Matcher m(node->InputAt(2));
   InstructionOperand shift_operand;
   if (m.HasValue()) {
     shift_operand = g.UseImmediate(m.node());
   } else {
     shift_operand = g.UseUniqueRegister(m.node());
   }
 
-  InstructionOperand inputs[] = {g.UseRegister(node->InputAt(0)),
+  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
                                  g.UseRegister(node->InputAt(1)),
                                  shift_operand};
 
   InstructionOperand outputs[] = {
-      g.DefineSameAsFirst(node),
+      g.DefineAsRegister(node),
       g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
-  Emit(kArmPairLsl, 2, outputs, 3, inputs);
+  Emit(kArmLslPair, 2, outputs, 3, inputs);
 }
 
 void InstructionSelector::VisitWord32PairShr(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitWord32PairSar(Node* node) { UNIMPLEMENTED(); }
 
 void InstructionSelector::VisitWord32Ror(Node* node) {
   VisitShift(this, node, TryMatchROR);
 }
 
@@ skipping 936 matching lines @@
              MachineOperatorBuilder::kFloat64RoundTiesAway |
              MachineOperatorBuilder::kFloat32RoundTiesEven |
              MachineOperatorBuilder::kFloat64RoundTiesEven;
   }
   return flags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8