[M] Change in dart/sdk[main]: [vm] Use btrq for x64 write barrier tag updates.

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Ryan Macnak (Gerrit)

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Jan 21, 2026, 5:33:12 PM (7 hours ago) Jan 21
to Alexander Markov, Commit Queue, dart-vm-compil...@google.com, rev...@dartlang.org, vm-...@dartlang.org
Attention needed from Alexander Markov

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Ryan Macnak . resolved

I saw the C++ compiler prefers this over CAS for the fetch_and in the marker.

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Gerrit-Project: sdk
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Gerrit-Change-Id: Ibc5789a0d93c815abe9b7e612f1b2f008a6e725b
Gerrit-Change-Number: 474764
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