Merge branch 'ss/builtin-cleanup'

"git help $cmd" unnecessarily enumerated potential command names
from the filesystem, even when $cmd is known to be a built-in.

Ideas for further optimization, primarily by killing the use of
is_in_cmdlist(), were suggested in the discussion, but they can
come as follow-ups on top of this series.

* ss/builtin-cleanup:
  builtin/help.c: speed up is_git_command() by checking for builtin commands first
  builtin/help.c: call load_command_list() only when it is needed
  git.c: consistently use the term "builtin" instead of "internal command"

Documentation/technical/api-builtin.txt

@@ -14,8 +14,8 @@ Git:
 
 . Add the external declaration for the function to `builtin.h`.
 
-. Add the command to `commands[]` table in `handle_internal_command()`,
-  defined in `git.c`.  The entry should look like:
+. Add the command to the `commands[]` table defined in `git.c`.
+  The entry should look like:
 
 	{ "foo", cmd_foo, <options> },
 +