addremove: don't do full walks

Full walks are only necessary when the caller needs the list of clean files.
addremove by definition doesn't need them.

With this patch and an extension that produces a subset of results for
dirstate.walk when full is False, on a repository with over 200,000 files, hg
addremove drops from 2.8 seconds to 0.5.

mercurial/scmutil.py

@@ -755,7 +755,8 b' def _interestingfiles(repo, matcher):'
 
     ctx = repo[None]
     dirstate = repo.dirstate
-    walkresults = dirstate.walk(matcher, sorted(ctx.substate), True, False)
+    walkresults = dirstate.walk(matcher, sorted(ctx.substate), True, False,
+                                full=False)
     for abs, st in walkresults.iteritems():
         dstate = dirstate[abs]
         if dstate == '?' and audit_path.check(abs):