[llvm] [Verifier] Require that dbg.declare variable is a ptr (PR #134355)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

SGTM, I can't think of a reason we should allow non-ptrs there. Just an inline question around test changes. @SLTozer do you have any additional comments? (I'll let you hit the approve button)

https://github.com/llvm/llvm-project/pull/134355