Revert "Optimize SkBlend by using NEON intrinsics"
Revert "Optimize SkBlend by using NEON intrinsics"

This reverts commit 7adde145d3913cfd67b90bf83a9ea54386a285a7.

Reason for revert: may be breaking our Android One test bots.

Original change's description:
> Optimize SkBlend by using NEON intrinsics
> 
> Use NEON intrinsics to check the alpha channel of the pixels.
> 
> In some case, it's about 14 times faster than the original implementation.
> 
> $ ./bin/droid out/arm64_release/nanobench  --samples 300 --nompd --match LinearSrcOver -v > neon_opt.log
> $ ./bin/compare neon_opt.log clean.log
>      LinearSrcOver_yellow_rose.pngVSkOptsDefault         1.8ms -> 24.9ms        13.8x
>        LinearSrcOver_iconstrip.pngVSkOptsDefault        5.71ms -> 69.8ms        12.2x
>            LinearSrcOver_plane.pngVSkOptsDefault        1.45ms ->   11ms        7.62x
>         LinearSrcOver_baby_tux.pngVSkOptsDefault        1.88ms -> 9.96ms        5.29x
>     LinearSrcOver_mandrill_512.pngVSkOptsDefault        1.41ms -> 4.62ms        3.29x
>      LinearSrcOver_yellow_rose.pngVSkOptsTrivial        24.9ms -> 24.9ms        1x
>  LinearSrcOver_yellow_rose.pngVSkOptsNonSimdCore        2.17ms -> 2.18ms        1x
>            LinearSrcOver_plane.pngVSkOptsTrivial        11.1ms -> 11.1ms        1x
>        LinearSrcOver_plane.pngVSkOptsNonSimdCore         1.5ms ->  1.5ms        1x
> LinearSrcOver_mandrill_512.pngVSkOptsNonSimdCore        2.39ms -> 2.39ms        1x
>    LinearSrcOver_iconstrip.pngVSkOptsNonSimdCore        6.43ms -> 6.43ms        1x
>      LinearSrcOver_baby_tux.pngVSkOptsBruteForce        22.3ms -> 22.3ms        1x
>   LinearSrcOver_yellow_rose.pngVSkOptsBruteForce        45.5ms -> 45.5ms        1x
>     LinearSrcOver_baby_tux.pngVSkOptsNonSimdCore        2.02ms -> 2.02ms        1x
>        LinearSrcOver_iconstrip.pngVSkOptsTrivial        69.7ms -> 69.7ms        1x
>         LinearSrcOver_baby_tux.pngVSkOptsTrivial        9.96ms -> 9.95ms        1x
>  LinearSrcOver_mandrill_512.pngVSkOptsBruteForce        99.3ms -> 99.2ms        1x
> 
> BUG=skia:
> 
> CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD
> 
> Change-Id: Ia576365578d65b771440da65fdf41f090ccf0541
> Reviewed-on: https://skia-review.googlesource.com/6860
> Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org>
> Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org>
> 

TBR=14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org,bsalomon@google.com,joel.liang@arm.com,reviews@skia.org
BUG=skia:
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: Ie40eb5a7c27807aaf396429a82a1a2dd328c2b5b
Reviewed-on: https://skia-review.googlesource.com/7036
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org>
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@chromium.org>

Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,google/skia,aosp-mirror/platform_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,rubenvb/skia,rubenvb/skia,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,google/skia,google/skia,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc