Roll SwiftShader from 2e89a70e3561 to 588d32cb3f17 (4 revisions)

https://swiftshader.googlesource.com/SwiftShader.git/+log/2e89a70e3561..588d32cb3f17

2021-01-08 capn@google.com Reduce the LLVM compile layer object lifetime
2021-01-08 capn@google.com Reduce the mangler object lifetime
2021-01-08 capn@google.com Eliminate duplicate LLVM contexts
2021-01-08 srisser@google.com Fix mismatched signedness for a compare in subzero

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: I2b8229e3ee52871cfc9fad31cefa58ebbadd7d9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618091Reviewed-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@{#841757}

DEPS

@@ -215,7 +215,7 @@ 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': '2e89a70e3561793871480d971f4e958d04faf37a',
+  'swiftshader_revision': '588d32cb3f172d1a6092c2b3c7e5a5c5d8b3b06e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.