This reverts commit f23f644f.

Reason for revert: Breaks arm debug builder - https://ci.chromium.org/p/v8/builders/ci/V8%20Arm%20-%20debug%20builder/22390 - missing file?

Original change's description:
> Speed up CharacterRange::AddCaseEquivalents
> 
> By using the lexCss("color:") to measure the performance
> The change make the lexCss("color:")
>   x21 - x40 times faster than trunk.
>   x2.3 - x4.6 times faster than m74.
> 
> Design Doc: http://shorturl.at/adfO5
> 
> Measured by out/x64.release/d8 reg977003.js
> see reg977003.js attached to chromium:977003
> 
> Also see another cl of benchmark in
> https://chromium-review.googlesource.com/c/v8/v8/+/1679651/
> 
> 
> Bug: chromium:977003
> Change-Id: Ie8518493d2c33df1594be1b4576bda715087b421
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1674851
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62471}

TBR=adamk@chromium.org,jkummerow@chromium.org,yangguo@chromium.org,jshin@chromium.org,gsathya@chromium.org,ftang@chromium.org

Change-Id: I780fac2cf5f4bae6846f8d5c8765cabd76637545
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:977003
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1684073Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62472}