Roll src/third_party/swiftshader f8df30f1ad44..b07147b04082 (6 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/f8df30f1ad44..b07147b04082

git log f8df30f1ad44..b07147b04082 --date=short --no-merges --format='%ad %ae %s'
2019-10-29 sugoi@google.com Provoking vertex fixes
2019-10-28 sugoi@google.com VK_EXT_provoking_vertex support
2019-10-28 jonahr@google.com Fix vulkan builds in ANGLE on MacOS
2019-10-25 sugoi@google.com Removed stencil reference from PixelProcessor::States
2019-10-25 amaiorano@google.com Fix LLVM7 partially initialized ManagedStatic
2019-10-24 sugoi@google.com Fixed using an offset in Blitter::blitFromBuffer()

Created with:
  gclient setdep -r src/third_party/swiftshader@b07147b04082

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/swiftshader-chromium-autoroll
Please CC swiftshader-team+autoroll@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=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_chromium_msan_rel_ng;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=swiftshader-team+autoroll@google.com

Bug: chromium:1015454,chromium:b/143288278,chromium:1015904
Change-Id: I0c957affa260014664c34f0257fba3fff4bf664b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888057Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#710467}

DEPS

@@ -188,7 +188,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.
-  'swiftshader_revision': 'f8df30f1ad44d275b73e87510b7d600ded9fe239',
+  'swiftshader_revision': 'b07147b040826e4464bc92bf8f62a18dd2a8f126',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.