Revert "lowp bilerp_clamp_8888"
Revert "lowp bilerp_clamp_8888"

This reverts commit ef96fa9e83c28334b2060607ac9c815521cb18ad.

Reason for revert: Breaks Chrome's pixel and layout tests.

Original change's description:
> lowp bilerp_clamp_8888
>
> Use scaling multipy, _mm_mulhrs_epi16(Intel) and vqrdmulhq_s16(ARM),
> to implement bilerp_8888_clamp.
>
> This CL results in 756usec to 590usec improvement for
> samplingoptions_filter_1_mipmap_0 on Intel. For ARM, this improvement
> is 1180usec -> 897usec.
>
> This CL introduces scaled_mult which takes fixed-point numbers on the
> interval [-1, 1) and returns a result which is rescaled to the
> interval [-1, 1).
>
> It also introduces the notion of constrained_add(I16, U16) where the
> result is guaranteed to be U16. This avoids moving to a 32-bit integer
> for during the computation.
>
> Change-Id: I410e494364039df63e5976f433f7e68355e9cfbf
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/443896
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>

Change-Id: I715be7bdbb706725770560e49a4d9f0777d2c22b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/453256
Auto-Submit: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>
Commit-Queue: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>

aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia