commit: fix bug where dirstate for removed file is confused

This fixes issue586

tests/test-586

@@ -0,0 +1,19 b''
+#!/bin/sh
+# a test for issue586
+
+hg init a
+cd a
+echo a > a
+hg ci -Ama
+
+hg init ../b
+cd ../b
+echo b > b
+hg ci -Amb
+
+hg pull -f ../a
+hg merge
+hg rm -f a
+hg ci -Amc
+
+hg st -A

tests/test-586.out

@@ -0,0 +1,13 b''
+adding a
+adding b
+pulling from ../a
+searching for changes
+warning: repository is unrelated
+adding changesets
+adding manifests
+adding file changes
+added 1 changesets with 1 changes to 1 files (+1 heads)
+(run 'hg heads' to see heads, 'hg merge' to merge)
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+(branch merge, don't forget to commit)
+C b

mercurial/localrepo.py

@@ -810,6 +810,8 b' class localrepository(repo.repository):'
             if f in m1:
                 del m1[f]
                 removed.append(f)
+            elif f in m2:
+                removed.append(f)
         mn = self.manifest.add(m1, tr, linkrev, c1[0], c2[0], (new, removed))
 
         # add changeset