[llvm] [DebugInfo] Fix crash in declare-to-assign when memcpy writes to scalable-vector alloca (PR #194107)

[Orlando Cazalet-Hyams via llvm-commits]

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OCHyams wrote:

I see, I was confused as to why the dbg_declare was still being preserved at first but it looks like that's handled here

https://github.com/llvm/llvm-project/pull/194107