This reverts commit f5a8352b.

Reason for revert: Performance issues

Original change's description:
> [embedded-builtins] Enable on all arches except x86 for benchmarks
> 
> This CL enables embedded builtins to get benchmark feedback. We need
> this feedback to identify and address remaining performance problems.
> 
> Bug: v8:6666
> Change-Id: I8f77f218e656b55ddabe1236eb2a1d14a5ac6233
> Reviewed-on: https://chromium-review.googlesource.com/1105834
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53836}

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

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

Bug: v8:6666
Change-Id: I0e0897eefa069b0b9ad2dd56b2ffc3e3617f9258
Reviewed-on: https://chromium-review.googlesource.com/1139974
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54498}