[heap] Add TSAN suppression for lock-order inversion in Scavenger

The Scavenger currently requires taking the lock for OLD->NEW processing
and can also take another lock for sweeping a different page.

Since order of pages during scavenge and sweep is unstable this may
result in lock order inversion reports on TSAN when long-running
programms are only executed on a single thread.

The report is a false positve, hence flag it as suppression until we
redesign this particular piece.

No-try: true
Bug: v8:6923
Change-Id: I82355be1c8d83ea61cc21152aeb10b58b1dc4b86
Reviewed-on: https://chromium-review.googlesource.com/716261Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48504}

tools/sanitizers/tsan_suppressions.txt

@@ -4,3 +4,6 @@
 # Incorrectly detected lock cycles in test-lockers
 # https://code.google.com/p/thread-sanitizer/issues/detail?id=81
 deadlock:LockAndUnlockDifferentIsolatesThread::Run
+
+# https://bugs.chromium.org/p/v8/issues/detail?id=6923
+deadlock:v8::internal::ScavengingTask::RunInParallel
\ No newline at end of file