[llvm] [ARM] Fix VMOVRRD combine with non-canonical inserts. (PR #109639)

[Oliver Stannard via llvm-commits]

https://github.com/ostannard approved this pull request.

Nit: One of the "last"s in the commit message should be "first".

LGTM

https://github.com/llvm/llvm-project/pull/109639