Sanjay Patel 8efee510be [InstCombine] limit pair-of-insertelement folds to avoid miscompile ...

This transform was added with 4446f71ce3. However, as noted in
the post-commit feedback, the transform is not safe with an
arbitrary base vector because we may leak poison from a narrow
element into an adjacent element when bitcasting.

I made the least invasive code change in case we do figure out
a way to make this safe.

2022-12-15 08:27:43 -05:00

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