Prevent deopt when assigning double values to typed arrays

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..384d467cf915dc3655b35dab3f9a3041e40c68fb 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -858,17 +858,9 @@ 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;
-        break;
-      }
-    }
-    can_deopt = !can_truncate;
-  }
+  bool can_deopt = op == Token::SHR &&
+      constant_value == 0 &&
+      !instr->representation().Equals(Representation::TruncatedInteger32());
 
   LInstruction* result =
       DefineSameAsFirst(new LShiftI(op, left, right, can_deopt));