This reverts commit c0fbfcd8.

Reason for revert: Fix found.

Original change's description:
> Revert [gasm] Implement ReduceArrayPrototypeReduce using the graph assembler
> 
> Reverting due to a nondeterministic correctness issue bisected to this
> change. The intent is to reland once we fully understand and have
> fixed the problem.
> 
> The original CL landed in https://crrev.com/c/1934329.
> The revert on master is https://crrev.com/c/2049763.
> The revert on 8.0 is https://crrev.com/c/2049764.
> 
> Bug: v8:9972,chromium:1049982
> Change-Id: I171624bdeb18831e70869ae806c73529c240be4a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2049763
> Reviewed-by: Georg Neis <neis@chromium.org>
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66215}

TBR=neis@chromium.org,jgruber@chromium.org

Change-Id: Id12a01dc72558639b26af58ff56cd0b11916eec2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9972, chromium:1049982
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2050395Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66222}