This reverts commit ec75df58.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> ComputeHammingDistance reduce SIMD loop to 1 call when possible.
> 
> 32 bit x86 has high overhead due to -fpic.  So this reduces the
> number of calls by 1.
> 
> TBR=kjellander@chromium.org
> Bug: libyuv:701
> Test: BenchmarkHammingDistance
> Change-Id: I7f557ef047920db65eab362a5f93abbd274ca051
> Reviewed-on: https://chromium-review.googlesource.com/701755
> Reviewed-by: Frank Barchard <fbarchard@google.com>
> Reviewed-by: Cheng Wang <wangcheng@google.com>

TBR=rrwinterton@gmail.com,fbarchard@google.com,wangcheng@google.com

Change-Id: Ia61e8558a8f083c14be5f51e0e141550b6f2b5c1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: libyuv:701
Reviewed-on: https://chromium-review.googlesource.com/707823Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>