Roll third_party/externals/swiftshader 2cb1db08e5f1..11cb891a01a2 (4 commits)
Roll third_party/externals/swiftshader 2cb1db08e5f1..11cb891a01a2 (4 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/2cb1db08e5f1..11cb891a01a2

git log 2cb1db08e5f1..11cb891a01a2 --date=short --first-parent --format='%ad %ae %s'
2020-01-18 capn@google.com Rename multiSampledBresenham to enableMultiSampling
2020-01-18 capn@google.com Take advantage of return value optimization
2020-01-17 capn@google.com Enable filtering of YCbCr formats
2020-01-17 capn@google.com Rename createBlend4 to createShuffle4

Created with:
  gclient setdep -r third_party/externals/swiftshader@11cb891a01a2

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 3ef7217be91069877d94f7907ce5479000772cd3@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: 3ef7217be91069877d94f7907ce5479000772cd3@google.com
Change-Id: I7b8195500637b1b942a8d06e97f3fed1b778eb00
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265317
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

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