Check that constant is an integer before getting its value in HGraphBuilder::MatchRotateRight.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 6dae101b08c1e41a05304a14b33f12029da793a2..2881e90534a0ab22935fc5ba26fd4c33b7a0e81a 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -8932,13 +8932,7 @@ static bool ShiftAmountsAllowReplaceByRotate(HValue* sa,
   }
   if (!const32_minus_sa->IsSub()) return false;
   HSub* sub = HSub::cast(const32_minus_sa);
-  if (sa != sub->right()) return false;
-  HValue* const32 = sub->left();
-  if (!const32->IsConstant() ||
-      HConstant::cast(const32)->Integer32Value() != 32) {
-    return false;
-  }
-  return (sub->right() == sa);
+  return sub->left()->EqualsInteger32Constant(32) && sub->right() == sa;
 }