amend: check for file modifications when updating dirstate (issue6233)
Previously, we called dirstate.normal(f), which would put information into the
dirstate claiming that the file on disk is what it "should be" for the current
checkout, and it would have the size and timestamp of the most recent
modification to the file (which is not necessarily the one we just committed).
If the file was modified while the commit message editor was open, we would put
incorrect information into the dirstate.
Differential Revision: https://phab.mercurial-scm.org/D7521
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