971016: EH frame_init trouble on Sparc

[Jeffrey A Law]

  In message <199710221010.MAA21092@baht.labs.trema.com>you write:
  > I attempted to throw exceptions in a large C++ application
  > using snapshot 971016, and ran into trouble.
  > 
  > The problem is that find_fde calls frame_init if pc_begin is zero.
  > However, frame_init finds the lowest pc_begin as zero, causing
  > the application to hang and eventually crash.  I think it is doing
  > initializations over and over again, and frame_init keeps allocating
  > more and more memory.
I believe this was fixed in the 10/31 snapshot.

jeff