sjlj-exceptions ICE. simplified test case

[Jeffrey A Law]

  In message < 20000426213151.F0F6534D80@nile.gnat.com >you write:
  > Actually GNAT currently uses an unwind mechanism for x86 which works by
  > scanning the prologue. This code is well documented and should be easily 
  > adaptable; I would be willing to do the work if people agree that having
  > such an unwinder would be nice.
How does this work in the presence of scheduled prologues?  More and more
targets schedule their prologue which results in prologue instructions being
mixed with user code (BTW this includes x86).

jeff