[cft] subreg validation round 2

[Janis Johnson]

On Wed, Nov 17, 2004 at 10:40:09AM -0800, Richard Henderson wrote:
> This passes on i686, alpha, ia64, powerpc linux, and sparc-solaris.
> Given Ulrich's previous testing, it *ought* to pass on s390.  Any
> other takers before I check it in and have to pick up pieces after
> the fact?

Together with a patch that Alan Modra sent yesterday, it works on
powerpc64-unknown-linux-gnu with -m32 and -m64.  I only built and tested
C and C++, but that's where I saw problems with earlier versions.

Janis