[Bug fortran/40756] Cleanup TREE_BLOCK

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40756

Bug 40756 depends on bug 37132, which changed state.

Bug 37132 Summary: Debug: No DW_TAG_namelist emitted for NAMELISTS
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37132

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED