fix long-standing debug-name confusion

fix long-standing debug-name confusion

  The calls to IR1-CONVERT-LAMBDA-BODY with the a VARARGS-ENTRY and
  HAIRY-ARG-PROCESSOR debug-names were no such things.

  These calls produces the actual lambda for the main body of the function,
  and as such should have the original source-name and debug-name.

  As proof of the pudding, we previously failed to detect several known
  function that are recursive but aren't marked as such in the DEFKNOWNs. With
  this that changes, so fix the DEFKNOWNs.