[turbofan] Remove check in IsMoreGeneralElementsKindTransition

This check is likely unneeded.

Change-Id: Ie2b39f64312c362aabcb7168d6f1f1312b82d40c
Reviewed-on: https://chromium-review.googlesource.com/1146735
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54697}

src/elements-kind.cc

@@ -130,11 +130,9 @@ static inline bool IsFastTransitionTarget(ElementsKind elements_kind) {
 
 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
                                          ElementsKind to_kind) {
-  if (IsFixedTypedArrayElementsKind(from_kind) ||
-      IsFixedTypedArrayElementsKind(to_kind)) {
-    return false;
-  }
   if (IsFastElementsKind(from_kind) && IsFastTransitionTarget(to_kind)) {
+    DCHECK(!IsFixedTypedArrayElementsKind(from_kind));
+    DCHECK(!IsFixedTypedArrayElementsKind(to_kind));
     switch (from_kind) {
       case PACKED_SMI_ELEMENTS:
         return to_kind != PACKED_SMI_ELEMENTS;