[llvm] [polly] Reapply "IR: Remove uselist for constantdata (#137313)" (PR #138961)

[Hans Wennborg via llvm-commits]

zmodem wrote:

We've bisected an assertion failure to this commit:

```
clang: /work/llvm-project/llvm/include/llvm/IR/Value.h:360: llvm::Value::const_use_iterator llvm::Value::materialized_use_begin() const: Assertion `hasUseList()' failed.
```

There's a stack and reproducer at https://crbug.com/417175765#comment3

Can you take a look?

I've started a creduce run, but it might take a while.

https://github.com/llvm/llvm-project/pull/138961