Roll third_party/externals/swiftshader 64c44b0c53c4..f96948857780 (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/64c44b0c53c4..f96948857780


git log 64c44b0c53c4..f96948857780 --date=short --no-merges --format='%ad %ae %s'
2019-02-11 capn@google.com Fix shader call stack size mismatch
2019-02-11 chrisforbes@google.com Use spirv-tools optimizer in GraphicsPipeline
2019-02-11 chrisforbes@google.com Replace Shader,VertexShader,PixelShader with SpirvShader


Created with:
  gclient setdep -r third_party/externals/swiftshader@f96948857780

The AutoRoll server is located here: https://autoroll.skia.org/r/swiftshader-skia-autoroll

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Debian9-Clang-GCE-GPU-SwiftShader-x86_64-Debug-All-SwiftShader
TBR=stephana@google.com

Change-Id: Icf7a4b514f0b0e8b0a730aa88ba325fbd9bb79d8
Reviewed-on: https://skia-review.googlesource.com/c/191308
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
1 file changed