Beef up the PAIP queues a bit and (ab)use them in the compiler
This eliminates the other use of arrays in the register allocation process,
which was eting a few percent of our total runtime.
    
        | author | Steve Losh <steve@stevelosh.com> | 
    
        | date | Mon, 11 Jul 2016 23:37:37 +0000 | 
    
        | parents | 410acaae0c14 | 
    
        | children | 31305584b29b | 
(2 code-push-instruction!)
(1 repeat)
(2 define-instruction define-instructions)
(1 with-database)
(3 with-cell)
(2 set-when-unbound)
(1 recursively)
(1 when-let)
(1 rule)
(0 push-logic-frame-with)