[PATCH 1 of 2] dispatch: move detection of profiling earlier during startup

[Jun Wu]

This breaks extensions that wraps maybeprofile, namely
fb-hgext/profiling.py which tries to log interactive time.

That said, I think we could just remove profiling.py as Simon's change is a
superior solution.

Excerpts from Bryan O'Sullivan's message of 2017-02-13 20:50:10 -0800:
> # HG changeset patch
> # User Bryan O'Sullivan <bryano at fb.com>
> # Date 1487047460 28800
> #      Mon Feb 13 20:44:20 2017 -0800
> # Node ID 82467bdb090b2500a97ae92e239bcdf72974f3f7
> # Parent  a0e3d808690d57d1c9dff840e0b8ee099526397b
> dispatch: move detection of profiling earlier during startup
> 
> diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
> --- a/mercurial/dispatch.py
> +++ b/mercurial/dispatch.py
> @@ -655,6 +655,15 @@ def _dispatch(req):
>      rpath = _earlygetopt(["-R", "--repository", "--repo"], args)
>      path, lui = _getlocal(ui, rpath)
>  
> +    uis = set([ui, lui])
> +
> +    if req.repo:
> +        uis.add(req.repo.ui)
> +
> +    if '--profile' in args:
> +        for ui_ in uis:
> +            ui_.setconfig('profiling', 'enabled', 'true', '--profile')
> +
>      # Configure extensions in phases: uisetup, extsetup, cmdtable, and
>      # reposetup. Programs like TortoiseHg will call _dispatch several
>      # times so we keep track of configured extensions in _loaded.
> @@ -721,21 +730,12 @@ def _dispatch(req):
>                  (t[4]-s[4], t[0]-s[0], t[2]-s[2], t[1]-s[1], t[3]-s[3]))
>          atexit.register(print_time)
>  
> -    uis = set([ui, lui])
> -
> -    if req.repo:
> -        uis.add(req.repo.ui)
> -
>      if options['verbose'] or options['debug'] or options['quiet']:
>          for opt in ('verbose', 'debug', 'quiet'):
>              val = str(bool(options[opt]))
>              for ui_ in uis:
>                  ui_.setconfig('ui', opt, val, '--' + opt)
>  
> -    if options['profile']:
> -        for ui_ in uis:
> -            ui_.setconfig('profiling', 'enabled', 'true', '--profile')
> -
>      if options['traceback']:
>          for ui_ in uis:
>              ui_.setconfig('ui', 'traceback', 'on', '--traceback')