* stabsread.c (define_symbol): Complain about unrecognized names

* stabsread.c (define_symbol):  Complain about unrecognized names
that begin with CPLUS_MARKER (often '$'), but don't die.  Fix
suggested by gb@cs.purdue.edu (Gerald Baumgartner).
(read_cpp_abbrev):  Don't use the class name as part of the
vtable pointer member name (_vptr$) in $vf abbrevs or unrecognized
abbrevs.  Inspired by Mike Tiemann.
(read_tilde_fields):  Comment.  Remove ancient dead code.
Remove erroneous but non-dead code.  Simplify.  Add complaints.
(in general):  Remove extraneous (parentheses) in return
statements.