This reverts commit 71d29f78.

Reason for revert: Needs test skips https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Arm/9744

Original change's description:
> [nojit] Don't flush the icache in jitless mode
> 
> We don't allocate executable memory in jitless mode hence there's no
> need to flush the icache.
> 
> Bug: v8:7777
> Change-Id: I70a1884e6c9f11405465f5741f2eccd4f7a273fb
> Reviewed-on: https://chromium-review.googlesource.com/c/1488765
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59887}

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

Change-Id: I548bcbbd5c6df542dd647b8bbb8accae62e197e6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7777
Reviewed-on: https://chromium-review.googlesource.com/c/1491600Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59908}