This reverts commit de335c16.

Reason for revert: Might actually regress CPU overhead perf.
Unsure but it's possible the reported perf improvement was due
to variance.

Original change's description:
> Vulkan: Implement a SharedResourceUse pool
> 
> When adding a Resource to the ResourceUseList of ContextVk
> we constructed a new SharedResourceUse object for tracking
> and update of the Resource's Serial. We would then delete
> it after releasing the resource. This incurs repeated
> memory operation costs.
> 
> Instead we now allocate a pool of SharedResourceUse objects
> and acquire and release from this pool as needed.
> 
> VTune profile of the Manhattan 30 offscreen benchmark
> shows the CPU occupancy of bufferRead decrease from an
> average of 0.9% -> 0.6% and imageRead decreases from
> an average of 0.4% -> 0.3%. The bottleneck for both
> these methods is the retain() method that leverages
> the new SharedResourceUse pool.
> 
> Bug: angleproject:4950
> Change-Id: Ib4f67c6f101d4b2de118014546e6cc14ad108703
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2396597
> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Mohan Maiya <m.maiya@samsung.com>

TBR=syoussefi@chromium.org,jmadill@chromium.org,m.maiya@samsung.com

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

Bug: angleproject:4950
Change-Id: I40081551c3db67d6e55182fea40119946ed16ac3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2426479Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>