view .clang-format @ 48677:8e5effbf52d0 stable

branchmap: stop writing cache for uncommitted data

If we are about to write the branch while a transaction is active. we delay
that write.  After the transaction is closed, we flush all the write we delayed
(unless they have been written in between).

Differential Revision: https://phab.mercurial-scm.org/D12128

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