[llvm] [LegalizeType] Fix VECTOR_DEINTERLEAVE widening with incorrect insert_subvector (PR #207245)

[Craig Topper via llvm-commits]

topperc wrote:

> > Does the test crash before this change?
> 
> Correct. For all fairness I don't really have to split it into a separate commit (for test that previously crashed)

Agreed. I just wasn't sure if it was a crash or bad codegen.

https://github.com/llvm/llvm-project/pull/207245