C++ ptrmemfun break if FUNCTION_BOUNDARY < 2 * BITS_PER_UNIT

[dewar@gnat.com]

<<I think that's not the main problem.  The problem is that we have an
implicit assumption hidden deep inside the C++ front-end, and there's
no validation anywhere preventing a definition of FUNCTION_BOUNDARY
from breaking violating this assumption.
>>

Well that's a very fair comment, most certainly this assumption needs to
be documented at the top level, and an explicit check of FUNCTION_BOUNDARY
as well as large documentation surrounding it is most appropriate :-)