rebase: only store collapse message once
The message is determined by the user passing --message or --log when
the rebase is started. There's no need to write it to a file for each
rebased commit; writing it once at the start of the rebase is enough.
Differential Revision: https://phab.mercurial-scm.org/D2712
BasedOnStyle: LLVM
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2