Roll clang llvmorg-12-init-3492-ga1caa302-1 : llvmorg-12-init-4187-g33ce275f-1.

Ran `tools/clang/scripts/upload_revision.py 33ce275fc156c8b015acfad918937028b2cc235c`.

Bug: 1120645
Change-Id: I44b20217fb4468bd9d73e8a2ec83ec6f09840e2f
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:win-chrome,win64-chrome,mac-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377875Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802287}

tools/clang/scripts/update.py

@@ -38,7 +38,7 @@ 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-3492-ga1caa302'
+CLANG_REVISION = 'llvmorg-12-init-4187-g33ce275f'
 CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s' % (CLANG_REVISION, CLANG_SUB_REVISION)