[tsan] Suppress known TSAN absl notifications.

Bug: 1158622
Change-Id: Ic0da2e0942d030478b2c7570ee920f35cba63ac7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591908
Commit-Queue: Andres Medina <medinaandres@chromium.org>
Auto-Submit: Andres Medina <medinaandres@chromium.org>
Reviewed-by: Danil Chapovalov <danilchap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837166}

build/sanitizers/tsan_suppressions.cc

@@ -132,6 +132,9 @@ char kTSanDefaultSuppressions[] =
     // https://crbug.com/1056011
     "race:third_party/libjpeg_turbo/simd/x86_64/jsimd.c\n"
 
+    // https://crbug.com/1158622
+    "race:absl::synchronization_internal::Waiter::Post\n"
+
     // End of suppressions.
     ;  // Please keep this semicolon.