[PATCH 0/5] more parallelization fixes

[Tom Tromey]

This series updates more parts of the test suite to be parallel-safe.
I think the patches are all reasonably straightforward.

After this series, we still aren't really done, but we're much closer
to the end.  I think there will be one more series like this one --
just updates to various tests -- and then the final patches to modify
the Makefiles and switch "make -jN check" to the new scheme.  At that
point I'll also dig up my notes and (re-)post some information about
how well the test suite scales.

Tom