Roll third_party/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/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-angle-autoroll
Please CC courtneygo@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

Bug: None
Tbr: courtneygo@google.com
Change-Id: Id1422ca8e34f6eaf013b47416a35bb7cefd67745
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2056308
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index caff2c6..db565e5 100644
--- a/DEPS
+++ b/DEPS
@@ -182,7 +182,7 @@
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@ac4e1d236088f90e3bc97aa67002ffe56042e4f2',
+    'url': '{swiftshader_git}/SwiftShader@f9f999f5a2eb6dd586a1da03e6b400d044ae6022',
     'condition': 'not build_with_chromium',
   },