Merge branch 'jk/revision-rewritten-parents-in-prio-queue'

Performance fix for "rev-list --parents -- pathspec".

* jk/revision-rewritten-parents-in-prio-queue:
  revision: use a prio_queue to hold rewritten parents

t/perf/p0001-rev-list.sh

@@ -14,6 +14,24 @@ test_perf 'rev-list --all --objects' '
 	git rev-list --all --objects >/dev/null
 '
 
+test_perf 'rev-list --parents' '
+	git rev-list --parents HEAD >/dev/null
+'
+
+test_expect_success 'create dummy file' '
+	echo unlikely-to-already-be-there >dummy &&
+	git add dummy &&
+	git commit -m dummy
+'
+
+test_perf 'rev-list -- dummy' '
+	git rev-list HEAD -- dummy
+'
+
+test_perf 'rev-list --parents -- dummy' '
+	git rev-list --parents HEAD -- dummy
+'
+
 test_expect_success 'create new unreferenced commit' '
 	commit=$(git commit-tree HEAD^{tree} -p HEAD) &&
 	test_export commit