rtl slot lies

[Jeffrey A Law]

  In message <19980508135900.45179@dot.cygnus.com>you write:
  > While working on a garbage collector, I discovered that the
  > INLINE_HEADER rtl was lying about the types of some of its slots.
  > 
  > The following patch corrects this, and gets rid of wome ugly casts.
Actually, the tree field should be accessed via "rttree", which would
allow you to kill a few more casts *and* avoid storing a tree node
into a rtx field.

jeff