[llvm] [BPF] Handle certain mem intrinsic functions with addr-space arguments (PR #160025)

[via llvm-commits]

https://github.com/eddyz87 approved this pull request.

The need to create a new instance of the intrinsic because of the address space change is inconvenient indeed. Otherwise something as simple as this would have sufficed:

``` cpp
switch (Callee->getIntrinsicID()) {
  case Intrinsic::memset:
    aspaceWrapOperand(&Cache: CastsCache, I: &I, OpNum: 0);
  ...
}
```

https://github.com/llvm/llvm-project/pull/160025