+;;;
+;;; FIXME: The IR1-CONVERTING-NOT-OPTIMIZING-P argument is what the
+;;; old CMU CL code called IR1-P, without explanation. My (WHN
+;;; 2002-01-09) tentative understanding of it is that we can call this
+;;; operation either in initial IR1 conversion or in later IR1
+;;; optimization, and it tells which is which. But it would be good
+;;; for someone who really understands it to check whether this is
+;;; really right.
+(defun recognize-known-call (call ir1-converting-not-optimizing-p)