[gomp4] handle missing OMP_LIST_ clauses in fortran's parse tree debugger

[Cesar Philippidis]

While debugging gfortran with -fdump-fortran-*, I noticed that a couple
of OMP_LIST_ entries weren't being handled show_omp_clauses so I've
added them. I also took advantage of the opportunity to rearrange the
the cases in the switch statement that handles those lists in a way that
matches the enum in gfortran.h because I couldn't figure out how things
were ordered before.

I've applied this patch to gomp-4_0-branch.

Cesar
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