Slow down, latest updates

[Bill Heagy]

For the last updates, my little test program has slowed down by a factor 
of more than 4, debian 32 and 64 bit.  (Same updates as the compiler 
problem appeared, I think.)

∇rr←sol nn
n←1↓⍳nn
r←,2
l:
→(nn<(↑n)*2)⍴x
r←r,↑n←(~∨⌿0=⊃r|¨⊂n)/n
→l
x:
r←r,1↓n
rr←+/r
∇
sol 200000