Linearize lookahead/place-delay targets.
Linearize lookahead/place-delay targets.

Signed-off-by: Keith Rothman <1bc19627a439baf17510dc2d0b2d250c96d445a5@users.noreply.github.com>

SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs