Procedure to add a new primop

Step 1:
  o compiler/DEVNOTES/Flint/primop-list		-- add description
  o compiler/FLINT/kernel/primop.{sig,sml}	-- add primop definition
  o compiler/ElabData/basics/primoptypemap.sml  -- add with intrinsic type
  o compiler/FLINT/trans/primopmap.sml          -- add representation
  o compiler/Semant/statenv/prim.sml		-- add to Inline structure
  o compiler/Semant/pickle/pickmod.sml	-- pickle 
  o compiler/Semant/pickle/unpickmod.sml -- unpickle

	-- compile with -rebuild	
	-- compile to fixpoint

Step 2:
  o compiler/FLINT/cps/cps.{sig,sml}		-- add cps primop
  o compiler/FLINT/cps/ppcps.sml		-- primop to string
  o compiler/FLINT/cps/convert.sml		-- conversion to cps
  o compiler/CodeGen/main/mlriscGen.sml		-- generate appropriate mltree
	
	-- compile compiler to fixpt

Step 3:
  o system/smlnj/init/built-in.sml		-- add to InlineT
  o <use primop where you like> usually in 
	system/Basis/Implementation
    [Note that InlineT is not visible in
     top-level environment.]


-------------------
Edit history:
[DBM: 5/23/07]
