Builder started failing earlier today:
https://uberchromegw.corp.google.com/i/chromiumos.chromium/builders/amd64-generic-tot-asan-informational

First failing build:
https://uberchromegw.corp.google.com/i/chromiumos.chromium/builders/amd64-generic-tot-asan-informational/builds/17111

Looks like bitmaptools might be failing:
chromeos-chrome-67.0.3377.0_alpha-r1: [4133/44583] LINK ./bitmaptools
chromeos-chrome-67.0.3377.0_alpha-r1: FAILED: bitmaptools 
chromeos-chrome-67.0.3377.0_alpha-r1: python "../../../../../../../home/chrome-bot/chrome_root/src/build/toolchain/gcc_link_wrapper.py" --output="./bitmaptools" -- x86_64-cros-linux-gnu-clang++ -B/usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.27.0-gold -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -fuse-ld=gold -B../../../../../../../home/chrome-bot/chrome_root/src/third_party/binutils/Linux_x64/Release/bin -m64 -Wl,-O2 -Wl,--gc-sections -Wl,--gdb-index -Wl,--fatal-warnings --sysroot=../../../../../../../build/amd64-generic -L../../../../../../../build/amd64-generic/lib64 -Wl,-rpath-link=../../../../../../../build/amd64-generic/lib64 -L../../../../../../../build/amd64-generic/usr/lib64 -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/lib64 -L../../../../../../../build/amd64-generic/usr/local/lib64 -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/local/lib64 -L../../../../../../../build/amd64-generic/lib -Wl,-rpath-link=../../../../../../../build/amd64-generic/lib -L../../../../../../../build/amd64-generic/usr/lib -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/lib -L../../../../../../../build/amd64-generic/usr/local/lib -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/local/lib -L../../../../../../../build/amd64-generic/usr/x86_64-cros-linux-gnu/lib -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/x86_64-cros-linux-gnu/lib -L../../../../../../../build/amd64-generic/usr/lib/llvm/lib64 -Wl,-rpath-link=../../../../../../../build/amd64-generic/usr/lib/llvm/lib64 -fsanitize=address -fsanitize-address-use-after-scope -Wl,-rpath-link=. -Wl,--disable-new-dtags -Wl,-rpath=\$ORIGIN/. -Wl,-rpath-link=. -Wl,-u_sanitizer_options_link_helper -fsanitize=address -fsanitize-address-use-after-scope -Wl,-O1 -Wl,-O2 -Wl,--as-needed -stdlib=libc++  -o "./bitmaptools" -Wl,--start-group @"./bitmaptools.rsp"  -Wl,--end-group   -ldl -lpthread -lrt 
chromeos-chrome-67.0.3377.0_alpha-r1: /usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.27.0/ld.gold.real: warning: Cannot export local symbol '_Unwind_RaiseException'
chromeos-chrome-67.0.3377.0_alpha-r1: /usr/x86_64-pc-linux-gnu/x86_64-cros-linux-gnu/binutils-bin/2.27.0/ld.gold.real: error: treating warnings as errors
chromeos-chrome-67.0.3377.0_alpha-r1: clang-7.0: error: linker command failed with exit code 1 (use -v to see invocation)