Roll src/third_party/swiftshader c45e066fba2d..8a7067d88174 (6 commits)

https://swiftshader.googlesource.com/SwiftShader.git/+log/c45e066fba2d..8a7067d88174

git log c45e066fba2d..8a7067d88174 --date=short --first-parent --format='%ad %ae %s'
2020-01-08 bclayton@google.com Pipeline/SpirvShader: Move setActiveLaneMask()
2020-01-08 bclayton@google.com Pipeline/SpirvShader: Support more OpExtInsts
2020-01-08 bclayton@google.com Pipeline/SpirvShader: Process OpString instructions
2020-01-08 bclayton@google.com Pipeline/SpirvShader: Add Impl struct
2020-01-08 bclayton@google.com Vulkan/Debug: Expose Frames from Thread
2020-01-08 sugoi@google.com Enable B10G11R11_UFLOAT blending

Created with:
  gclient setdep -r src/third_party/swiftshader@8a7067d88174

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
Bug: None
Tbr: swiftshader-team+autoroll@google.com
Change-Id: Ifeb50a3661276c4ba967f8591baa8b913acd1d48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991790Reviewed-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@{#729536}

DEPS

@@ -197,7 +197,7 @@ 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': 'c45e066fba2d8b6947fe1216c788f6ffbbb8a466',
+  'swiftshader_revision': '8a7067d8817495fc0af2da6d71d94f16693b9f3e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.