Fix uses of range analysis results in HChange.

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/a64/lithium-a64.cc b/src/a64/lithium-a64.cc
index a6a22905e9593ec665958ad0cfb41bc4104f0b02..756bbb98c4981396ba9a20d4005e4d56159d08a5 100644
--- a/src/a64/lithium-a64.cc
+++ b/src/a64/lithium-a64.cc
@@ -1141,13 +1141,11 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
       }
     } else if (to.IsSmi()) {
       LOperand* value = UseRegisterAtStart(instr->value());
+      LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
       if (instr->value()->CheckFlag(HInstruction::kUint32)) {
-        LUint32ToSmi* result = new(zone()) LUint32ToSmi(value);
-        return AssignEnvironment(DefineAsRegister(result));
-      } else {
-        // This cannot deoptimize because an A64 smi can represent any int32.
-        return DefineAsRegister(new(zone()) LInteger32ToSmi(value));
+        result = AssignEnvironment(result);
       }
+      return result;
     } else {
       ASSERT(to.IsDouble());
       if (instr->value()->CheckFlag(HInstruction::kUint32)) {