[llvm] [MachineLICM] Don't allow hoisting invariant loads across mem barrier. (PR #116987)

[Florian Hahn via llvm-commits]

fhahn wrote:

/cherry-pick https://github.com/llvm/llvm-project/commit/a9b3ec154d7ab2d0896ac5c9f1e9a1266a37be80 https://github.com/llvm/llvm-project/commit/ef102b4a6333a304e36dc623d5381257a7ef1ed6

https://github.com/llvm/llvm-project/pull/116987