Revert "Roll Clang from f77ce52b56d0 to 9a5fa3075ac6"

This reverts commit 65f16e3269.

Reason for revert: Causes TSAN failures

Original change's description:
> Roll Clang from f77ce52b56d0 to 9a5fa3075ac6
>
> If this roll has caused a breakage, revert this CL and stop the roller
> using the controls here:
> https://autoroll.skia.org/r/clang-dart-sdk
> Please CC dart-engprod@google.com,dart-vm-gardener@grotations.appspotmail.com,dart-vm-team@google.com on the revert to ensure that a human
> is aware of the problem.
>
> To file a bug in Clang: https://bugs.fuchsia.dev/p/fuchsia/issues/list?q=component%3AToolchain
> To file a bug in Dart SDK: https://github.com/dart-lang/sdk/issues
>
> To report a problem with the AutoRoller itself, please file a bug:
> https://issues.skia.org/issues/new?component=1389291&template=1850622
>
> Documentation for the AutoRoller is here:
> https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
>
> Cq-Include-Trybots: luci.dart.try:dart-sdk-linux-try;luci.dart.try:dart-sdk-linux-arm64-try;luci.dart.try:dart-sdk-mac-try;luci.dart.try:dart-sdk-mac-arm64-try;luci.dart.try:dart-sdk-win-try;luci.dart.try:vm-asan-mac-release-arm64-try
> Change-Id: Ia893f84d6979e722f5c293087f866c40707f868a
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/467760
> Commit-Queue: Alexander Aprelev <aam@google.com>
> Reviewed-by: Brian Quinlan <bquinlan@google.com>
> Reviewed-by: Alexander Aprelev <aam@google.com>

Cq-Include-Trybots: luci.dart.try:dart-sdk-linux-try;luci.dart.try:dart-sdk-linux-arm64-try;luci.dart.try:dart-sdk-mac-try;luci.dart.try:dart-sdk-mac-arm64-try;luci.dart.try:dart-sdk-win-try;luci.dart.try:vm-asan-mac-release-arm64-try
Change-Id: I881b0e7cda4e7aa2990527851926984c84299034
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/468321
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Brian Quinlan <bquinlan@google.com>

DEPS

@@ -75,7 +75,7 @@ vars = {
   "jsc_tag": "version:304239",
 
   # https://chrome-infra-packages.appspot.com/p/fuchsia/third_party/clang
-  "clang_version": "git_revision:9a5fa3075ac670e7d748b693895d4d347af5f83d",
+  "clang_version": "git_revision:f77ce52b56d025399f489a8c0aad8c18c4b06045",
 
   # https://chrome-infra-packages.appspot.com/p/gn/gn
   "gn_version": "git_revision:4e0818fd86bffc0b4a4b61d3295a6732ba08d715",