New flag: TREE_THIS_NOTRAP

[Jason Merrill]

On Fri, 11 Jun 2004 13:09:50 -0700, Richard Henderson <rth@redhat.com> wrote:

> Probably it would best be associated with the type of exp.
> That's the property that should be reliably propagated 
> during these transformations.  (There is a question of
> whether tree_ssa_useless_type_conversion would discard
> a type change between T* and T* nothrow, however.)

Yet another reason why tree_ssa_useless_type_conversion should go away in
favor of teaching optimizers to look back through the SSA chain.

Jason