* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Component>: Deal with
renaming discriminants in tagged types first.
* gcc-interface/trans.c (gnat_to_gnu) <N_Selected_Component>: Test
the underlying type of the prefix.
(Pragma_to_gnu, case Pragma_Warning): Ignore Reason => "..."
(process_freeze_entity): Reset the nodes of
all the view of a type, if any.
* gcc-interface/Makefile.in (x86 VxWorks): Add filter-out for vxworks7
and remove incorrect EH_MECHANISM macros.
Add sigtramp.h to EXTRA_LIBGNAT_SRCS when we add sigtramp-vxworks.o to
EXTRA_LIBGNAT_OBJS.