Roll third_party/SwiftShader 440fc9959f06..bc98fbeec99b (3 commits)
Roll third_party/SwiftShader 440fc9959f06..bc98fbeec99b (3 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/440fc9959f06..bc98fbeec99b

git log 440fc9959f06..bc98fbeec99b --date=short --first-parent --format='%ad %ae %s'
2020-03-18 amaiorano@google.com Subzero: fix external function calls on x86-32
2020-03-18 amaiorano@google.com Subzero: fix partially initialized ManagedStatic assert
2020-03-17 digit@google.com [vulkan]: Support multiple external semaphore implementations.

Created with:
  gclient setdep -r third_party/SwiftShader@bc98fbeec99b

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 aa371ec5c940a0ded89f7ed95bce84faebcf51df@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: angleproject:4482
Tbr: aa371ec5c940a0ded89f7ed95bce84faebcf51df@google.com
Change-Id: I09384435c826f4dd4eb3003006da8a8315e7c959
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2109617
Reviewed-by: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <09ea9b8bac6cceb6ec3b72e615745c3a1e982ce2@skia-public.iam.gserviceaccount.com>

ppy/angle,ppy/angle,ppy/angle,ppy/angle