PR60147: fix ICE with DECL_NAMELIST and tree-pretty-printer.c

[Tobias Burnus]

Since GCC 4.9, gfortran generates a DECL_NAMELIST (for DWARF's 
DW_TAG_namelist) - they are stored in the BIND_EXPR. Namelists are a bit 
boring: They only group variable names and the namelist name is only 
used in I/O statements (READ, WRITE) to permit a fancy data input [and 
output] - and for the debugger.

Due to DW_TAG_namelist, namelists are now exposed to the middle end - 
and I forgot to handle them also in the tree pretty printer - hence 
-fdump-tree-original now ICEs.

For the pretty printer one has two options: Ignoring (or "NYI;") the 
decl or dumping it. The attached patch does the latter.

Bootstrapped (C/C++/Fortran) and regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias
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