dirstate: drop the now unused magic constants for the dirstate module

We no longer need them for the dirstate logic. We only need them in the
dirstate map (and parsers) logic.

This smell like progress.

Differential Revision: https://phab.mercurial-scm.org/D10964

mercurial/dirstate.py

@@ -47,15 +47,6 b' filecache = scmutil.filecache'
 
 dirstatetuple = parsers.dirstatetuple
 
-# a special value used internally for `size` if the file come from the other parent
-FROM_P2 = dirstatemap.FROM_P2
-
-# a special value used internally for `size` if the file is modified/merged/added
-NONNORMAL = dirstatemap.NONNORMAL
-
-# a special value used internally for `time` if the time is ambigeous
-AMBIGUOUS_TIME = dirstatemap.AMBIGUOUS_TIME
-
 
 class repocache(filecache):
     """filecache for files in .hg/"""