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This reverts commit 6f7e5e79.

Reason for revert: This broke the build, e.g.
https://ci.chromium.org/p/chromium/builders/ci/ios-device/144512

../../third_party/zlib/cpu_features.c:75:13: error: unused function '_cpu_check_features' [-Werror,-Wunused-function]
static void _cpu_check_features(void)
            ^

Original change's description:
> Unify CPU features detection code
> 
> This will allow to remove some duplicated code (i.e. thread synchronization)
> while at same time removing unnecessary use of inline ASM for Intel features
> detection.
> 
> A few other advantages:
>  - remove some extra logic (e.g. no need to test the platform to include the
>    correct CPU detection header).
>  - simplifies the buildsystem (i.e. we always include cpu_features.c)
>  - get rid of the simd_stub file.
> 
> Bug: 1032721
> Change-Id: Ic93472d3337bc2cbe092d4cf8fbe4b31b1ceca6d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976820
> Reviewed-by: Chris Blume <cblume@chromium.org>
> Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#727038}

TBR=cavalcantii@chromium.org,cblume@chromium.org,mtklein@chromium.org,adenilson.cavalcanti@arm.com

Change-Id: I20c5dedb98ba8b5d304ff1339042bcf243505e88
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1032721
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979790Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727039}