[llvm] [MemDepAnalysis] Don't reuse NonLocalPointerDeps cache if memory location size differs (PR #116936)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

Still trying to understand the code to see if this is the correct fix, but figured I'd send this out to get thoughts

I'm having trouble coming up with a test case that isn't brittle.

https://github.com/llvm/llvm-project/pull/116936