Incorrect bitfield aliasing with Tree SSA

[Eric Botcazou]

> Eric, does this you think qualifies as a fix for PR 25737.  You had
> the same fix proposed in the PR so I would think so.

Not at all, please read more carefully.

> Bootstrapped and tested on x86_64-linux.
>
> OK?  Also is it OK for 4.1 and 4.2 after some time?

This is *not* OK, you're unduly pessimizing things at the RTL level.

-- 
Eric Botcazou