going from a SYMBOL_REF to a decl node

[Jeffrey A Law]

  In message < 20000403193231.C2775@wolery.cumb.org >you write:
  > Maybe I should describe the real problem.  I was trying to fix a
  > bug provoked by the sibcall optimizer:
  > 
  > void x(void) { abort(); }
  > void y(void) { something(); }
  > 
  > gcc thinks neither x nor y can return.  This is because the RTL for
  > both functions looks like
At the RTL level, y does not return.  It merely jumps into something (), 
control flow will never return into y.
jeff