[project @ 2001-03-20 12:37:25 by simonpj]

[project @ 2001-03-20 12:37:25 by simonpj]
-------------------------------------
	Be less keen about inlining primops
	-------------------------------------

Marcin pointed out that it's bad to take

	let x = a +# (b *# c)
	in
	x + f x + g x

and inline x to get

	(a +# (b *# c)) +
	f (a +# (b *# c)) +
	g (a +# (b *# c))

Yet that's just what we were doing.  The offending clause is
in PrimOp.primOpIsCheap, which regards some primop applications
as 'cheap' (and hence freely duplicable).

For now, I've made it return False.  Let's see what that does.