This reverts commit 84853ad1.

Reason for revert: Blocking LKGR because of Arm timeouts, see
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20arm%20-%20sim%20-%20debug/16047

Original change's description:
> [turbofan] Temporarily disable OSR for performance data
> 
> Just set the flag --use-osr to false by default.
> If it's set to true on the command line, then it'll be on.
> 
> I'd like to get some performance metrics on various tests spread
> throughout our performance bot infrastructure.
> 
> Change-Id: I1ebc33264505af080901e531dca625452880f81b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1558089
> Reviewed-by: Maya Lekova <mslekova@chromium.org>
> Commit-Queue: Michael Stanton <mvstanton@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60693}

TBR=mvstanton@chromium.org,mslekova@chromium.org

Bug: chromium:950934

Change-Id: I6c713f33f491bda49cd1d1d2f155f1971217089e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1559859Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60719}