exception-section patch, part 0

[Jeffrey A Law]

  In message < 199806302140.XAA10515@halles.ilog.fr >you write:
  > g++ still emits exception handling code to the normal text section, thus
  > clobbering upto 50% of the CPU's instruction cache with normally useless
  > instructions. The following patch enables gcc to emit exception handling
  > code to another section.
  > 
  > This time, I've splitted the patch into small pieces. This may make it
  > easier for Jeff to review it.
A note -- I am not the right person to review this code and I will not
be looking at it.  Andrew MacLeod and Jason Merrill are responsible
for the EH support.

jeff