[clang] [Clang][Interp] Fix the location of uninitialized base warning (PR #100761)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr commented:

![Screenshot from 2024-07-27 
07-04-02](https://github.com/user-attachments/assets/5a7c4b26-2c68-4bb1-8480-4b7ff9e4be87)

The three regressions all have similar stack traces:
```
 #5 0x000000000bba9f4c clang::Redeclarable<clang::TagDecl>::getFirstDecl() 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/Redeclarable.h:216:38
 #6 0x000000000bba9cd5 clang::Redeclarable<clang::TagDecl>::getMostRecentDecl() 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/Redeclarable.h:227:12
 #7 0x000000000bba9a69 clang::RecordDecl::getMostRecentDecl() 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/Decl.h:4168:59
 #8 0x000000000bba99b5 clang::CXXRecordDecl::getMostRecentDecl() 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:542:46
 #9 0x000000000bba9995 clang::CXXRecordDecl::getMostRecentDecl() const 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:546:5
#10 0x000000000bba9969 clang::CXXRecordDecl::dataPtr() const 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:458:5
#11 0x000000000bba9885 clang::CXXRecordDecl::data() const 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:463:11
#12 0x000000000bc92be5 clang::CXXRecordDecl::bases_begin() const 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:627:58
#13 0x000000000bc7a6a9 clang::CXXRecordDecl::bases() const 
/home/fedora/interp-tests/llvm-project/clang/include/clang/AST/DeclCXX.h:623:35
#14 0x00000000127e9d9f 
clang::interp::CheckFieldsInitialized(clang::interp::InterpState&, 
clang::SourceLocation, clang::interp::Pointer const&, clang::interp::Record 
const*) 
/home/fedora/interp-tests/llvm-project/clang/lib/AST/Interp/EvaluationResult.cpp:127:41
```
So I think it's cases where the decl is no CXXRecordDecl. 
This patch also drops the handling where the pointer descriptor was created for 
an expression - this might be relevant for those tests or not.

https://github.com/llvm/llvm-project/pull/100761
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