[project @ 2000-03-17 12:40:03 by simonmar]

[project @ 2000-03-17 12:40:03 by simonmar]
Add the readBlahOffAddr suite of primitives.  The previous method of
using indexStuffOffAddr didn't enforce proper ordering in the I/O
monad.

The indexBlahOffAddr primops may go away in the future if/when we
figure out how to make unsafePerformIO into a no-op at the back end.