- add more comments to sh3_vector_tlbmiss (no binary change). - arrange for data blocks to start on 32B cache line boundary.
- add more comments to sh3_vector_tlbmiss (no binary change).
- arrange for data blocks to start on 32B cache line boundary.

from uwe@netbsd
ok miod@ (with an indentation suggestion)

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars