tree ad6bd327de72f32414076ab64b5b6a8a8176d2e1
parent 4457de227816942700a22f48441295a0686d0ebc
author Alexander Aprelev <aam@google.com> 1607114332 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1607114332 +0000

[vm/slot] Use seq_cst memory order for failure-branch of compare_exchange.

This fixes flutter engine test failure on Windows where it complained about invalid load memory order for failure branch(default=acq_rel) for this operation.
acq_rel is not allowed for failed comparison test memory order(per https://en.cppreference.com/w/cpp/atomic/atomic/compare_exchange)

TEST=flutter/engine runtime_unittests on Windows

Change-Id: I59dd3aed04f483b2e2a82721e337b78b8e3190d3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175101
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>