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rtoy authored
Helmut Eller's patch sent to cmucl-imp on 2005-03-08.  This basically
means tracing recursive functions will show all recursions during the
trace and not just the final call.

code/debug-int.lisp:
o Apply Helmut's patch.  Tweak it so when the known-return convention
  is being used, we tell MAKE-BOGUS-LRA that we're using the
  known-return so we can handle it properly.

lisp/breakpoint.c:
o Add an extra parameter to compute_offset so we know we're handling a
  function-end breakpoint or not.  Needed because reg_CODE isn't
  pointing to the bogus lra in this case, so the offsets are all
  wrong.  We compute the right offset for the known return and return
  the offset as negative so we can tell.
o Adjust all callers of compute_offset.
o Adjust handle_function_end_breakpoint to handle negative offsets
  from compute_offset so we can get the right code component for the
  bogus lra.
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