Roll SwiftShader from 060020166679 to de9e649438ed (3 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/060020166679..de9e649438ed

2020-11-19 capn@google.com Fix GN build for aarch64
2020-11-19 zzyiwei@google.com AHB: minor clean up to avoid build failures on different platforms
2020-11-19 capn@google.com Add GN builds for Reactor unit tests

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/+doc/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;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: None
Tbr: swiftshader-team+autoroll@google.com
Change-Id: Ie91c87ffd94b4b2af5771df9e66b4ec29e0f1db1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550241Reviewed-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@{#829269}

DEPS

@@ -213,7 +213,7 @@ 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': '060020166679a265a2bc8250f4d78a7a8c29de89',
+  'swiftshader_revision': 'de9e649438ed3cc2ecf5c30ebf08f033d01270e6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.