Nikita Popov c6ad00d709 [InstSimplify] Return poison for out of bounds extractelement ...

This is the same change as D93990, but for extractelement rather
than insertelement.

> If idx exceeds the length of val for a fixed-length vector, the
> result is a poison value. For a scalable vector, if the value of
> idx exceeds the runtime length of the vector, the result is a
> poison value.

2021-01-03 18:15:58 +01:00

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