Revert "Roll src/third_party/swiftshader a095711c5d77..51b2800bb317 (1 commits)"

This reverts commit e2ff113c.

Reason for revert: This CL makes mac-builder-perf build flaky and continusly have compile error.

Original change's description:
> Roll src/third_party/swiftshader a095711c5d77..51b2800bb317 (1 commits)
> 
> https://swiftshader.googlesource.com/SwiftShader.git/+log/a095711c5d77..51b2800bb317
> 
> git log a095711c5d77..51b2800bb317 --date=short --first-parent --format='%ad %ae %s'
> 2020-03-05 capn@google.com Support launching PowerVR samples from Visual Studio using SwiftShader
> 
> Created with:
>   gclient setdep -r src/third_party/swiftshader@51b2800bb317
> 
> 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: Ie79b6461aa9c2c778cdedb03e51f6d3d7bc8383f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090076
> Reviewed-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@{#747352}

TBR=chromium-autoroll@skia-public.iam.gserviceaccount.com,swiftshader-team+autoroll@google.com

Change-Id: Ic1b18034af1867e7bc26a075d2bb98f9320c8f41
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
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
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090991Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747542}

DEPS

@@ -191,7 +191,7 @@ 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': '51b2800bb317d9ab6026e6123c62f013dd5cf5e4',
+  'swiftshader_revision': 'a095711c5d771437d7f9bfcbd78a82062e19c55e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.