Roll third_party/externals/swiftshader 7e857092052e..18daa81e3d3d (9 commits)
Roll third_party/externals/swiftshader 7e857092052e..18daa81e3d3d (9 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/7e857092052e..18daa81e3d3d

git log 7e857092052e..18daa81e3d3d --date=short --first-parent --format='%ad %ae %s'
2020-03-12 sugoi@google.com Allow 3D filtering in the Blitter
2020-03-12 capn@google.com Fix building with latest LLVM
2020-03-12 capn@google.com Document single-level YCbCr image assumption
2020-03-12 capn@google.com Clarify the PointCoord calculation
2020-03-12 capn@google.com Remove unnecessary point setup calculations
2020-03-12 capn@google.com Don't needlessly build LLVM
2020-03-12 bclayton@google.com Update Marl to 64d123947
2020-03-12 bclayton@google.com VkImage: Implement BC7 texture format
2020-03-11 bclayton@google.com Update Marl to 94a361cf0

Created with:
  gclient setdep -r third_party/externals/swiftshader@18daa81e3d3d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-skia-autoroll
Please CC 794c0b5534edf5601d88e1d41975d0262da12894@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Cq-Include-Trybots: skia/skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
Bug: None
Tbr: 794c0b5534edf5601d88e1d41975d0262da12894@google.com
Change-Id: I8ed220b1e1f3cabd9c4708869d3bf3fb31847db5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/276856
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

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