As suggested by Tom, this patch restricts the right-hand argument of

As suggested by Tom, this patch restricts the right-hand argument of
bytealike to TEXT.

This leaves like_escape_bytea() without anything to do, but I left it in
place in anticipation of the eventual bytea pattern selectivity
functions. If there is agreement that this would be the best long term
solution, I'll take it as a TODO for 7.4.

Joe Conway