Revert "Reland "zlib: inflate using wider loads and stores""

This reverts commit 0397489124ce7e6aced020f8b85f5034c7d5f49b.

Reason for revert: appears to break Cronet.

Original change's description:
> Reland "zlib: inflate using wider loads and stores"
> 
> This reverts commit e1f30a329eccf19ce1c8772e873abf88970cb65c.
> 
> Reason for revert: This patch was originally reverted because
> we have an ARMv6 build target (part of Cronet) which
> incorrectly set NEON support in our build files. As a result,
> the NEON intrinsics were included despite ARMv6 not
> supporting NEON.
> 
> The build problem was addressed here:
> https://chromium-review.googlesource.com/c/chromium/src/+/639931
> 
> Now that ARMv6 builds do not set NEON support, these zlib
> changes (which are only applied if NEON support is set in the
> build) will not cause errors on ARMv6 targets.
> 
> BUG=697280
> 
> Original change's description:
> > zlib: inflate using wider loads and stores
> > 
> > In inflate_fast() the output pointer always has plenty of room to write.  
> > This means that so long as the target is capable, wide un-aligned 
> > loads and stores can be used to transfer several bytes at once.
> > 
> > When the reference distance is too short simply unroll the data a 
> > little to increase the distance. Patch by Simon Hosie.
> > 
> > PNG decoding performance gains should be around 30-33%.
> > 
> > BUG=697280
> > 
> > Change-Id: I59854eb25d2b1e43561c8a2afaf9175bf10cf674
> > Reviewed-on: https://chromium-review.googlesource.com/627098


> > Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
> > Reviewed-by: Mike Klein <mtklein@chromium.org>
> > Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#497866}
> >
> 
> Change-Id: I0b4cd1a393464c960c6a1e48a022a20340781e75
> Reviewed-on: https://chromium-review.googlesource.com/641575


> Commit-Queue: Chris Blume <cblume@chromium.org>
> Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Reviewed-by: Leon Scroggins <scroggo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#498580}

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

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

Bug: 697280
Change-Id: I200e0e3b9cb9c884acfd6868067464a5f6cef804
Reviewed-on: https://chromium-review.googlesource.com/669259


Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#502474}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7a620575b0512b33708e723c260fe66b90b5b103