new HP demangling, gcc/demangle.h

[Jeffrey A Law]

  In message < 199812081335.FAA08406@dm.cobaltmicro.com >you write:
  > 
  > Please put include/demangle.h and gcc/demangle.h into
  > sync because it causes compile failures since the new HP
  > demangling bits are not present in the gcc/demangle.h copy.
Better yet, I've killed the demangle.h in the gcc subdir.  It should have
gone away during the conversion to use libiberty and its associated include
files, but I missed it.

jeff