Suppress a race when the GC visits thread stacks.
Suppress a race when the GC visits thread stacks.

BUG=569682
TBR=haraken@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_tsan_rel_ng

Review URL: https://codereview.chromium.org/1526623003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365297}

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