Promote the constant pool pointer.

[ltratt]

This is constant for every Proto, so promoting it allows us to optimise some stuff out of the trace.

[vext01]

Nice. Any speedup measured?

[ltratt]

Oops yes:

 permute/lua/1000         7982 ± 903   6434 ± 354   0.81  19.39% faster
 towers/lua/600           7491 ± 573   6382 ±  94   0.85  14.80% faster
 bounce/lua/1500          8406 ± 241   7657 ± 223   0.91  8.91% faster
 deltablue/lua/12000      8058 ± 295   7657 ±  96   0.95  4.98% faster
 Heightmap/lua/2000       6880 ±   5   6713 ±   9   0.98  2.43% faster

permute is very nondeterministic but that does seem to be real.

[vext01]

that's good!

[ltratt]

(Hopefully) fixed the non-yk-compilation build errors in the force push.