graft: don't remove from a list in a loop...
graft: don't remove from a list in a loop
This addresses a TODO added in
a1381eea7c7d (graft: do not use
`.remove` on a smart set (regression), 2014-04-28). I couldn't measure
any speedup.
Differential Revision:
https://phab.mercurial-scm.org/D7805