58e6d02aa2
This aims to fix the crash in #168495, my combine rule was missing a check that the source vector was in fact a vector. This then caused the legality check to fail in this example as the concat was trying to concat a non vector. I have also gated the bitcast of the concat to only work on non-scalable vectors as the mutation calls `getNumElements` which crashes when called on a scalable vector. Fixes #168495