Roll clang llvmorg-12-init-5627-gf086e85e-3 : llvmorg-12-init-10666-gc9f69ee7-1.

Ran `./tools/clang/scripts/upload_revision.py c9f69ee7`.

Disable ArcDataSnapshotdManagerBasicTest.RestoredAfterCrash under msan
since it has uninitialized memory accesses that the new compiler
identifies (https://crbug.com/1144452)

Bug: 1126953,1144452
Change-Id: I8e526de19b723ac7a4b5ca36c511d70378b7f68f
Cq-Include-Trybots: chromium/try:chromeos-amd64-generic-cfi-thin-lto-rel
Cq-Include-Trybots: chromium/try:dawn-win10-x86-deps-rel
Cq-Include-Trybots: chromium/try:linux-chromeos-dbg
Cq-Include-Trybots: chromium/try:linux_angle_deqp_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_cfi_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_chromeos_asan_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_chromeos_msan_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_compile_dbg_32_ng
Cq-Include-Trybots: chromium/try:linux_chromium_msan_rel_ng
Cq-Include-Trybots: chromium/try:mac-arm64-rel,mac_chromium_asan_rel_ng
Cq-Include-Trybots: chromium/try:win-angle-deqp-rel-64
Cq-Include-Trybots: chromium/try:win-asan,win7-rel,win-angle-deqp-rel-32
Cq-Include-Trybots: chrome/try:iphone-device,ipad-device
Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Cq-Include-Trybots: chrome/try:win64-chrome,mac-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518420
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824053}

components/arc/enterprise/arc_data_snapshotd_manager_unittest.cc

@@ -239,7 +239,13 @@ TEST_F(ArcDataSnapshotdManagerBasicTest, UpstartFailures) {
   EXPECT_FALSE(manager.bridge());
 }
 
-TEST_F(ArcDataSnapshotdManagerBasicTest, RestoredAfterCrash) {
+#if defined(MEMORY_SANITIZER)
+// https://crbug.com/1144452
+#define MAYBE_RestoredAfterCrash DISABLED_RestoredAfterCrash
+#else
+#define MAYBE_RestoredAfterCrash RestoredAfterCrash
+#endif
+TEST_F(ArcDataSnapshotdManagerBasicTest, MAYBE_RestoredAfterCrash) {
   SetUpRestoredSessionCommandLine();
   // The attempt to stop the daemon, started before crash.
   ExpectStopDaemon(true /*success */);

tools/clang/plugins/SuppressibleDiagnosticBuilder.h

@@ -30,9 +30,6 @@ class SuppressibleDiagnosticBuilder : public clang::DiagnosticBuilder {
       // doesn't try to emit the diagnostic.
 
       // TODO(crbug.com/1140409) Remove in the next Clang roll.
-#ifndef LLVM_FORCE_HEAD_REVISION
-      FlushCounts();
-#endif
       Clear();
       // Also clear the current diagnostic being processed by the
       // DiagnosticsEngine, since it won't be emitted.
@@ -41,16 +38,6 @@ class SuppressibleDiagnosticBuilder : public clang::DiagnosticBuilder {
   }
 
   // TODO(crbug.com/1140409) Remove in the next Clang roll.
-#ifndef LLVM_FORCE_HEAD_REVISION
-  template <typename T>
-  friend const SuppressibleDiagnosticBuilder& operator<<(
-      const SuppressibleDiagnosticBuilder& builder,
-      const T& value) {
-    const DiagnosticBuilder& base_builder = builder;
-    base_builder << value;
-    return builder;
-  }
-#endif
 
  private:
   clang::DiagnosticsEngine* const diagnostics_;

tools/clang/scripts/update.py

@@ -38,8 +38,8 @@ import zipfile
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
 # This is the output of `git describe` and is usable as a commit-ish.
-CLANG_REVISION = 'llvmorg-12-init-5627-gf086e85e'
-CLANG_SUB_REVISION = 3
+CLANG_REVISION = 'llvmorg-12-init-10666-gc9f69ee7'
+CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s' % (CLANG_REVISION, CLANG_SUB_REVISION)
 RELEASE_VERSION = '12.0.0'