Blame doc/README.rs6000

Packit d28291
We have so far failed to find a good way to determine the stack base.
Packit d28291
It is highly recommended that GC_stackbottom be set explicitly on program
Packit d28291
startup.  The supplied value sometimes causes failure under AIX 4.1, though
Packit d28291
it appears to work under 3.X.  HEURISTIC2 seems to work under 4.1, but
Packit d28291
involves a substantial performance penalty, and will fail if there is
Packit d28291
no limit on stack size.
Packit d28291
Packit d28291
There is no thread support.  (I assume recent versions of AIX provide
Packit d28291
pthreads?  I no longer have access to a machine ...)