localrepo: don't reference transaction from hook closure (issue5043)

Before, the hook() closure (which is called as part of locking hooks)
would maintain a reference to a transaction instance (which should be
finalized by the time lock hooks are called). Because we accumulate
hook() instances when there are multiple transactions per lock, this
would result in holding references to the transaction instances which
would lead to higher memory utilization.

Creating a reference to the hook arguments dict minimizes the number
of objects that are kept alive until the lock release hook runs,
minimizing memory "leaks."

mercurial/localrepo.py

@@ -1085,9 +1085,15 b' class localrepository(object):'
         def txnclosehook(tr2):
             """To be run if transaction is successful, will schedule a hook run
             """
+            # Don't reference tr2 in hook() so we don't hold a reference.
+            # This reduces memory consumption when there are multiple
+            # transactions per lock. This can likely go away if issue5045
+            # fixes the function accumulation.
+            hookargs = tr2.hookargs
+
             def hook():
                 reporef().hook('txnclose', throw=False, txnname=desc,
-                               **tr2.hookargs)
+                               **hookargs)
             reporef()._afterlock(hook)
         tr.addfinalize('txnclose-hook', txnclosehook)
         def txnaborthook(tr2):