gcc conformance to HP-PA ABI

[Jeffrey A Law]

  In message < 20000707175220.927DE5F5F6@dublin.ACT-Europe.FR >you write:
  > 
  >   Yes, agreed, but I thought that it was not supported by gcc on the PA 
  >   (typically missing some INCOMING_XXX macro things or alike).
You're going to have to hack the compiler regardless if what solution you
use.

Better to hack it in the direction we'd like to go (dwarf2 unwinders) than 
in a direction we do not want to go (compatible with HP's unwinder library).

jef