[patch] Implement LEADZ and TRAILZ (Fortran 2008 intrinsics)

[Paul Richard Thomas]

Hi Steven,

> The attached patch implements LEADZ and TRAILZ from the F2008
> standard. This was an enhancement request in Bugzilla.
> Bootstrapped&tested on i686-cygwin and on ia64-linux. OK?

That looks OK to me.  I noticed the request on clf.  I guess that you
should hold off with an engancement until gcc-4.4 is out of the door.

Cheers

Paul