.arcconfig

typing: add several assertions to dirstatemap to appease pytype

(grafted from default to stable)

I think it's been mentioned in IRC that these can't be None in this case.  This
fixes:

    File "/mnt/c/Users/Matt/hg/mercurial/dirstatemap.py", line 213, in addfile: unsupported operand type(s) for &: 'None' and 'int' [unsupported-operands]
      No attribute '__and__' on None or '__rand__' on int
    Called from (traceback):
      line 290, in reset_state
    File "/mnt/c/Users/Matt/hg/mercurial/dirstatemap.py", line 214, in addfile: unsupported operand type(s) for &: 'None' and 'int' [unsupported-operands]
      No attribute '__and__' on None or '__rand__' on int
    Called from (traceback):
      line 290, in reset_state

Differential Revision: https://phab.mercurial-scm.org/D11235

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