Deduplicate TSAN false positives

[jonathanmetzman]

I think not doing this contributed to so many testcases being opened and wasting a lot of CPU.

[Environment] TSAN_OPTIONS=atexit_sleep_ms=200:external_symbolizer_path=/mnt/scratch0/clusterfuzz/resources/platform/linux/llvm-symbolizer:flush_memory_ms=2000:handle_abort=1:handle_segv=1:handle_sigbus=1:handle_sigfpe=1:handle_sigill=1:history_size=3:print_summary=1:print_suppressions=0:report_signal_unsafe=0:report_thread_leaks=0:stack_trace_format=DEFAULT:suppressions=/mnt/scratch0/clusterfuzz/src/appengine/config/suppressions/tsan_suppressions.txt:symbolize=1:symbolize_inline_frames=false:use_sigaltstack=1
[Command line] /mnt/scratch0/clusterfuzz/bot/builds/chromium-browser-tsan_linux-release_e1f0dbf462d779d5196ef318a224a998657a9c66/revisions/chrome --user-data-dir=/mnt/scratch0/tmp/user_profile_0 --js-flags="--expose-gc" --no-first-run --disable-gpu --no-sandbox --disable-in-process-stack-traces /mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/fuzz-241.html
+----------------------------------------Release Build Stacktrace----------------------------------------+
FATAL: ThreadSanitizer: unexpected memory mapping 0x5cf7c81fb000-0x5cf7c82d3000
[1008833:1008833:0126/210411.525509:ERROR:socket.cc(120)] recvmsg: Connection reset by peer (104)
[1008833:1008833:0126/210411.549415:FATAL:crashpad_linux.cc(195)] Check failed: client.StartHandler(handler_path, *database_path, metrics_path, url, annotations, arguments, false, false).
#0 0x56d14ef0a6a1 <unknown>
#1 0x56d1585716ef <unknown>
#2 0x56d158553146 <unknown>
#3 0x56d1583f6769 <unknown>
#4 0x56d1583f605d <unknown>
#5 0x56d1583ce16a <unknown>
#6 0x56d1583ce250 <unknown>
#7 0x56d1583cdd1d <unknown>
#8 0x56d15d115124 <unknown>
#9 0x56d15d10721f <unknown>
#10 0x56d14ef682f8 <unknown>
#11 0x56d156d2cca6 <unknown>
#12 0x56d156d2a25d <unknown>
#13 0x56d156d2a6a0 <unknown>
#14 0x56d14ef658d7 <unknown>
#15 0x56d14ef65637 <unknown>
#16 0x7d08989c2083 <unknown>
#17 0x56d14eec002a <unknown>