syntax: use uint32 for tokens too
syntax: use uint32 for tokens too

Since operators and positions often go together in node structs, this
helps shave off a little more space.

name                    old alloc/op   new alloc/op   delta
Parse/Binary+Redirs-4     4.57kB ± 0%    4.49kB ± 0%  -1.75%  (p=0.002 n=6+6)

mvdan/sh,mvdan/sh,mvdan/sh,mvdan/sh