Merge branch 'ls/hint-rev-list-count' into maint

* ls/hint-rev-list-count:
rev-list: add --count to usage guide

diff --combined builtin/rev-list.c
index 88eddbd53aa598d36d0f106008094443c0913872,ee9e8725bb241ab6f684dc09c01d59388a74930f..c0b4b53652a39049ec06ba69f2dfc50a8c0873f7
--- 1/builtin/rev-list.c
--- 2/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@@ -42,6 -42,7 +42,7 @@@ static const char rev_list_usage[] 
  "    --abbrev=<n> | --no-abbrev\n"
  "    --abbrev-commit\n"
  "    --left-right\n"
+ "    --count\n"
  "  special purpose:\n"
  "    --bisect\n"
  "    --bisect-vars\n"
@@@ -355,7 -356,7 +356,7 @@@ int cmd_rev_list(int argc, const char *
        if (bisect_list)
                revs.limited = 1;
  
 -      if (use_bitmap_index) {
 +      if (use_bitmap_index && !revs.prune) {
                if (revs.count && !revs.left_right && !revs.cherry_mark) {
                        uint32_t commit_count;
                        if (!prepare_bitmap_walk(&revs)) {