Roll third_party/SwiftShader f8f6103..e1cda39 (2 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/f8f6103eb89f..e1cda3916cee

git log f8f6103..e1cda39 --date=short --no-merges --format='%ad %ae %s'
2019-10-29 sugoi@google.com vkGetPhysicalDeviceFeatures2 fix
2019-10-29 sugoi@google.com Provoking vertex fixes

Created with:
  gclient setdep -r third_party/SwiftShader@e1cda3916cee

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 ynovikov@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:3677,angleproject:3430,angleproject:3677,angleproject:3430
TBR=ynovikov@google.com
Change-Id: I9b60af8c54c22dfb34f4fec6a06adaa41eed186c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1889340
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

Author: angle-autoroll

DEPS

@@ -171,7 +171,7 @@ deps = {
   },
 
   'third_party/SwiftShader': {
-    'url': '{swiftshader_git}/SwiftShader@f8f6103eb89f074f18e05b85b7bcccf38bbc436f',
+    'url': '{swiftshader_git}/SwiftShader@e1cda3916ceef4721aa5075cb470919e9595e3cc',
     'condition': 'not build_with_chromium',
   },