[PATCH] Remove bogus optimization from may_alias_p

[Diego Novillo]

2008/10/19 Richard Guenther <rguenther@suse.de>:

> This removes a test where one subtest is always false and the
> other one is always true if unmodifiable_var_p (var) is true,
> which is obviously bogus.  On the trunk this causes false
> TBAA pruning of points-to sets.

This also prunes the case where a regular pointer is made to point to
a read-only variable.  The user gets a warning about mismatched const
settings.  So TBAA should be able to prune this.

You also need a test case.


Diego.