Change the Hydrogen representation of uses.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index faf640490b705a850e04dcbde83a91743694e9b3..b05e555e41ad5062155e75deefa762311f8caaef 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -858,22 +858,20 @@ LInstruction* LChunkBuilder::DoShift(Token::Value op,
 
   // Shift operations can only deoptimize if we do a logical shift
   // by 0 and the result cannot be truncated to int32.
-  bool can_deopt = (op == Token::SHR && constant_value == 0);
-  if (can_deopt) {
-    bool can_truncate = true;
-    for (int i = 0; i < instr->uses()->length(); i++) {
-      if (!instr->uses()->at(i)->CheckFlag(HValue::kTruncatingToInt32)) {
-        can_truncate = false;
+  bool may_deopt = (op == Token::SHR && constant_value == 0);
+  bool does_deopt = false;
+  if (may_deopt) {
+    for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
+      if (!it.value()->CheckFlag(HValue::kTruncatingToInt32)) {
+        does_deopt = true;
         break;
       }
     }
-    can_deopt = !can_truncate;
   }
 
   LInstruction* result =
-      DefineSameAsFirst(new LShiftI(op, left, right, can_deopt));
-  if (can_deopt) AssignEnvironment(result);
-  return result;
+      DefineSameAsFirst(new LShiftI(op, left, right, does_deopt));
+  return does_deopt ? AssignEnvironment(result) : result;
 }