High priority PRs

[Andrew Cagney]

I'm currently going through the PR database identifying a few PRs, 
making them High, the rest being put back to medium.

This idea is stolen straight from GCC.  A High Priority PR identifies 
something that is (hopefully) going to be fixed in the next release

The ones I'm identifying (HP/UX, AIX, True64) are config/build problems 
where a patch has been submitted.  (Hi Alex :-)

Andrew