[clang] [clang][CodeGen] Make `UnqualPtrTy` truly unqualified (PR #94388)

[Alex Voicu via cfe-commits]

AlexVlx wrote:

> There are still quite a few references to UnqualPtrTy that you're not changing yet are now wrong, no?
> 
> ```
> $ git grep --count '\<UnqualPtrTy\>' origin/main clang
> origin/main:clang/lib/CodeGen/CGAtomic.cpp:1
> origin/main:clang/lib/CodeGen/CGBlocks.cpp:1
> origin/main:clang/lib/CodeGen/CGBuiltin.cpp:13
> origin/main:clang/lib/CodeGen/CGCUDANV.cpp:1
> origin/main:clang/lib/CodeGen/CGExpr.cpp:2
> origin/main:clang/lib/CodeGen/CGObjCMac.cpp:1
> origin/main:clang/lib/CodeGen/CodeGenTypeCache.h:1
> origin/main:clang/lib/CodeGen/ItaniumCXXABI.cpp:10
> origin/main:clang/lib/CodeGen/Targets/PPC.cpp:1
> origin/main:clang/lib/CodeGen/Targets/Sparc.cpp:1
> ```

Right, going through these at the moment, I got sidetracked. 

https://github.com/llvm/llvm-project/pull/94388