[clang] [llvm] [mlir] [LLVM][TableGen] Rename `ListInit::getValues()` to `getElements()` (PR #140289)

[Rahul Joshi via cfe-commits]

jurahul wrote:

> I've landed [195e640](https://github.com/llvm/llvm-project/commit/195e640846765402d1a622006e6a9f9fa3192955) to fix the build failure from this PR. Thanks!

Thanks so much! 

https://github.com/llvm/llvm-project/pull/140289