Expand list of GhcRTSWays to enable use of stack trace in parallel programs

[Michał J. Gajda]

I noticed that Ubuntu, as well as Debian and original packages come without some variants of threaded debugging binaries.
A recent change added of printing a stack trace with -xc option requires using both -ticky and profiling compile options,
which in turn forces program to be compiled in a -debug RTS way.
Since stack trace looks like indispensable debugging tool, and convenient parallelization is strength of Haskell,
I wonder is there any remaining reason to leave beginners with a cryptic error message
when they try to debug a parallel or threaded application, and want to take advantage of stack trace?

The resulting ghc-prof package would be increased by less than 1%.

Here is a patch for Ubuntu/Debian GHC 7.4.2 package, as well as upstream.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Gianfranco Costamagna (costamagnagianfranco)]

Hi Michal, do you think this patch is still needed?