This reverts commit 5253d7bf.

Reason for revert: Elements don't properly invalidate the cache.

Original change's description:
> [runtime] Cache prototype chain enumerable keys in PrototypeInfo
> 
> This CL adds a prototype_chain_enum_cache to cache the enumeration of a
> prototype and its entire chain on the PrototypeInfo. It can improve for-in
> performance via simply merging the receiver enumeration with this cache.
> 
> It improves the score of JetStream2-tagcloud-SP case by ~9% on IA Chromebook.
> 
> Contributed by tao.pan@intel.com
> 
> Change-Id: Ib40bfe41e772672337155584672f06fa1ba1e70d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1870844
> Commit-Queue: Shiyu Zhang <shiyu.zhang@intel.com>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#65224}

TBR=verwaest@chromium.org,shiyu.zhang@intel.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ic5d476bc8b334241b2accb8344749fcf7dcf5e09
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1943153Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65259}