Roll clang llvmorg-12-init-1771-g1bd7046e-5 : llvmorg-12-init-3492-ga1caa302-1.

Ran `./tools/clang/scripts/upload_revision.py a1caa302970de86b15d360212b526be8f1d59641`.

Bug: 1113154
Change-Id: I2fd71f7e0c200b9f3527a0773e70946fd4669808
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_msan_rel_ng
Cq-Include-Trybots: chromium/try:linux_chromium_chromeos_msan_rel_ng
Cq-Include-Trybots: chromium/try:linux-chromeos-dbg
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:linux_angle_deqp_rel_ng
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
Cq-Include-Trybots: chrome/try:mac-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363329
Commit-Queue: Arthur Eubanks <aeubanks@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799970}

build/config/compiler/BUILD.gn

@@ -1537,6 +1537,9 @@ config("default_warnings") {
 
           # TODO(https://crbug.com/1050281): Clean up, enable.
           "-Wno-non-c-typedef-for-linkage",
+
+          # TODO(https://crbug.com/1114873): Clean up, enable.
+          "-Wno-string-concatenation",
         ]
 
         cflags_c += [
@@ -1550,12 +1553,6 @@ config("default_warnings") {
           # TODO(https://crbug.com/1049569): Remove after Clang 87b235db.
           cflags += [ "-Wno-max-tokens" ]
         }
-
-        if (llvm_force_head_revision) {
-          # TODO(https://crbug.com/1114873):
-          # Remove after false positives are fixed
-          cflags += [ "-Wno-string-concatenation" ]
-        }
       }
     }
   }

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-1771-g1bd7046e'
-CLANG_SUB_REVISION = 5
+CLANG_REVISION = 'llvmorg-12-init-3492-ga1caa302'
+CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s' % (CLANG_REVISION, CLANG_SUB_REVISION)
 RELEASE_VERSION = '12.0.0'