Fix pattern detection for replacing shifts by rotation.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 335a40c65ef21cac7328c5fcff4606d1532cba00..eb72a3d5c10421ea09eee9427344ff29d21d3622 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -8464,6 +8464,7 @@ static bool ShiftAmountsAllowReplaceByRotate(HValue* sa,
                                              HValue* const32_minus_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) {
@@ -8492,6 +8493,7 @@ bool HOptimizedGraphBuilder::MatchRotateRight(HValue* left,
   } else {
     return false;
   }
+  if (shl->left() != shr->left()) return false;
 
   if (!ShiftAmountsAllowReplaceByRotate(shl->right(), shr->right()) &&
       !ShiftAmountsAllowReplaceByRotate(shr->right(), shl->right())) {