PRs vanishing from database

[Joseph S. Myers]

I tried checking the status of some of my PRs in the database (with a view
to closing a couple I think have been fixed) and found that some have
vanished - at least according to GNATSweb.

GNATSweb says "Error: no PRs matched" on searches for c/545, c/546 and
c/547.  All these PRs received an ack from GNATS and went through to the
gcc-bugs list.

-- 
Joseph S. Myers
jsm28@cam.ac.uk