Patch to detect constant functions.

[Jeffrey A Law]

  In message < 19990817222510.D23760@cygnus.com >you write:
  > On Wed, Aug 18, 1999 at 12:57:16AM -0400, John Wehle wrote:
  > > This patch allows gcc to detect and mark functions as constant by using
  > > the information from the alias analysis to determine if the function
  > > references memory which isn't local.
  > 
  > This is cool.
My reaction too :-)

jeff