[IC] PatchCache for no feedback state should be unreachable

Change-Id: I3768f2ca772d1ba60a5436a971c3f1966e8ab8f8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1741649Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63125}

src/ic/ic.cc

@@ -616,7 +616,7 @@ void IC::PatchCache(Handle<Name> name, const MaybeObjectHandle& handler) {
   DCHECK(IsAnyLoad() || IsAnyStore() || IsAnyHas());
   switch (state()) {
     case NO_FEEDBACK:
-      break;
+      UNREACHABLE();
     case UNINITIALIZED:
     case PREMONOMORPHIC:
       UpdateMonomorphicIC(handler, name);