Roll third_party/externals/swiftshader ac4e1d236088..f9f999f5a2eb (6 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/ac4e1d236088..f9f999f5a2eb

git log ac4e1d236088..f9f999f5a2eb --date=short --first-parent --format='%ad %ae %s'
2020-02-13 jonahr@google.com Implement HostMappedForeignMemory DeviceMemory
2020-02-13 bclayton@google.com Update Marl to a047dd0bb
2020-02-13 bclayton@google.com third_party/marl: Add mips64 support to BUILD.gn
2020-02-13 swiftshader.regress@gmail.com Regres: Update test lists @ ac4e1d23
2020-02-13 amaiorano@google.com Kokoro: build and run rr::Print unit tests
2020-02-13 amaiorano@google.com Fix rr::Print and add unit tests

Created with:
  gclient setdep -r third_party/externals/swiftshader@f9f999f5a2eb

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 stani@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: stani@google.com
Change-Id: Ibb24607d60d723135d283483abb23c427391d969
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270904
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