[clang] [clang-tools-extra] [lldb] Update `QualType::get{Split,Atomic,}UnqualifiedType` with `const ASTContext &` parameter (NFC). (PR #198388)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

So it isn't quite clear what you're trying to accomplish here.  But having the `getUnqualifiedType` functionality require an `ASTContext` seems unnecessary/not particularly acceptable.  Can we have a discussion/RFC about this to figure out what/why we are doing this? Is there perhaps a better way to accomplish whatever we're trying to accomplish here by doing this?

https://github.com/llvm/llvm-project/pull/198388