[ic] Remove unused IC::saved_state()

Bug: v8:10582
Change-Id: I89597bb31d1a0aa50672e8f579f5011da6be29e3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2400981Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69773}

src/ic/ic.h

@@ -136,10 +136,6 @@ class IC {
     return !target_maps_.empty() ? *target_maps_[0] : Map();
   }
 
-  State saved_state() const {
-    return state() == RECOMPUTE_HANDLER ? old_state_ : state();
-  }
-
   const FeedbackNexus* nexus() const { return &nexus_; }
   FeedbackNexus* nexus() { return &nexus_; }