[patch] Fix pr14893

[Rafael Espíndola]

The root problem is that we were speculating a load and not dropping
its range metadata. We know it is safe to speculate, but once we do we
cannot say anything about the value we get out of the load.

I noticed that there is not a convenient facility to drop all
non-debug metadata. Is that intentional? From the old discussions, if
I remember correctly, passes should drop metadata they know nothing
about. Is that still the case or have we moved to a model where
metadata is a proper part of the IR and passes have to know about it?

Cheers,
Rafael
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