[m-rev.] for review: Add thread.spawn_native/4 and thread.spawn/4.

[Peter Wang]

On Wed, 16 Jul 2014 17:09:34 +1000 (EST), Julien Fischer <jfischer at opturion.com> wrote:
> 
> This change has broken compilation of the standard library in the erlang
> grade (or at least uncovered a bug that prevents the standard library
> from compiling in the erlang grade).

Ok, the call cc_multi_equal(!IO) is not eliminated when intermodule
optimisation is _enabled_, producing code which tries to assign
a non-existent IO variable to another.

I'll commit a workaround tomorrow.

Peter