Roll clang n340759-eaabaf7e-2 : n341867-c2900381-1.

Ran `./tools/clang/scripts/upload_revision.py c29003813ab9bd6ea7b6de40ea8f1fe21979f13f`.

Suppress an msan diag due to new sigaltstack() instrumentation
that at first glance looks like a false positive.

TBR=hans

Binary-Size: Tracked in https://crbug.com/1047725
Bug: 1048323,1050279
Cq-Include-Trybots: chromium/try:mac_chromium_asan_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_msan_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_chromeos_msan_rel_ng
Cq-Include-Trybots: chromium/try:linux-chromeos-dbg,win-asan
Cq-Include-Trybots: chromium/try:chromeos-amd64-generic-cfi-thin-lto-rel
Cq-Include-Trybots: chromium/try:linux_chromium_compile_dbg_32_ng
Cq-Include-Trybots: chromium/try:win7-rel,win-angle-deqp-rel-32
Cq-Include-Trybots: chromium/try:win-angle-deqp-rel-64
Cq-Include-Trybots: chromium/try:dawn-win10-x86-deps-rel
Cq-Include-Trybots: chrome/try:iphone-device,ipad-device
Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Change-Id: I59ab61e46efe5363fd74988f0ce3e263d16dc69e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2044231Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739738}

tools/clang/scripts/update.py

@@ -39,9 +39,9 @@ import zipfile
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION = 'eaabaf7e04fe98990a8177a3e053346395efde1c'
-CLANG_SVN_REVISION = 'n340759'
-CLANG_SUB_REVISION = 2
+CLANG_REVISION = 'c29003813ab9bd6ea7b6de40ea8f1fe21979f13f'
+CLANG_SVN_REVISION = 'n341867'
+CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s-%s' % (CLANG_SVN_REVISION, CLANG_REVISION[:8],
                                 CLANG_SUB_REVISION)

tools/msan/blacklist.txt

@@ -18,3 +18,7 @@ fun:crc_fold512_to_32
 # False positives due to use of linux_syscall_support. http://crbug.com/394028
 src:*/third_party/breakpad/breakpad/src/*
 src:*/components/crash/content/app/breakpad_linux.cc
+
+# Reports from sigaltstack instrumentation. https://crbug.com/1050279
+fun:NaClSignalStackRegister
+fun:NaClSignalStackUnregister