[llvm] [llvm] annotate interfaces in llvm/DebugInfo for DLL export (PR #140778)

[Andrew Rogers via llvm-commits]

================
@@ -164,8 +170,6 @@ class LLVM_ABI ClassLayout : public UDTLayoutBase {
   explicit ClassLayout(const PDBSymbolTypeUDT &UDT);
   explicit ClassLayout(std::unique_ptr<PDBSymbolTypeUDT> UDT);
 
-  ClassLayout(ClassLayout &&Other) = default;
----------------
andrurogerz wrote:

The move constructor is implicitly deleted because I deleted the copy constructor in the parent class `UDTLayoutBase` to make the DLL build happy.

Leaving this default declaration in place results in a warning from Clang when building on Linux:
```
/home/user/src/llvm/llvm-project/llvm/include/llvm/DebugInfo/PDB/UDTLayout.h:173:3: warning: explicitly defaulted move constructor is implicitly deleted [-Wdefaulted-function-deleted]
  173 |   ClassLayout(ClassLayout &&Other) = default;
      |   ^
/home/user/src/llvm/llvm-project/llvm/include/llvm/DebugInfo/PDB/UDTLayout.h:168:30: note: move constructor of 'ClassLayout' is implicitly deleted because base class 'UDTLayoutBase' has a deleted move constructor
  168 | class LLVM_ABI ClassLayout : public UDTLayoutBase {
      |                              ^
/home/user/src/llvm/llvm-project/llvm/include/llvm/DebugInfo/PDB/UDTLayout.h:121:3: note: 'UDTLayoutBase' has been explicitly marked deleted here
  121 |   UDTLayoutBase(UDTLayoutBase const&) = delete;
      |   ^
/home/user/src/llvm/llvm-project/llvm/include/llvm/DebugInfo/PDB/UDTLayout.h:173:38: note: replace 'default' with 'delete'
  173 |   ClassLayout(ClassLayout &&Other) = default;
      |                                      ^~~~~~~
      |                                      delete
1 warning generated.`
```

https://github.com/llvm/llvm-project/pull/140778