PPC: [heap] Make write barrier safe for the concurrent marker.
Port bd3d091d Original Commit Message: With concurrent marking the write barrier should trigger even if the object is black because the concurrent marker could have fetched object field before marking the object black. R=ulan@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG=chromium:694255 LOG=N Change-Id: I3e3b5b467ab3c2eca45ac8d85523c8af4f5f5d4b Reviewed-on: https://chromium-review.googlesource.com/535736Reviewed-by: Junliang Yan <jyan@ca.ibm.com> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Commit-Queue: Jaideep Bajwa <bjaideep@ca.ibm.com> Cr-Commit-Position: refs/heads/master@{#45956}
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