cmd/compile: convert remaining mips rules to typed aux

Passes

  GOARCH=mips gotip build -toolexec 'toolstash -cmp' -a std
  GOARCH=mipsle gotip build -toolexec 'toolstash -cmp' -a std

Change-Id: I35df0522e299aa755491cd25f47f1f1bf447848c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229637
Reviewed-by: Keith Randall <[email protected]>

Author: ALTree