[llvm] [LLVM][SelectionDAG] Don't assume masked loads access all lanes in memory. (PR #192706)

[Nikita Popov via llvm-commits]

nikic wrote:

> NOTE: I do wonder if masked loads and store should using LocationSize::upperBound(VT.getStoreSize())?

Yes, that's generally the right thing to do for masked accesses.

https://github.com/llvm/llvm-project/pull/192706