<<loop>> when running hsc

[George Russell]

With ghc-4.08.1, running on Linux with -0 -O2-for-C, I get:

<<loop>>

With ghc-4.08, running on Solaris, with -O -O2-for-C, I get:

hsc: no threads to run:  infinite loop or deadlock?

With ghc-4.08, running on Solaris, with -Onot, the compilation works.
For the sources you will need the whole of UniForM again, instructions on
request.  What is going on?