[clang] [C++20] [Modules] [Itanium ABI] Generate the vtable in the module unit of dynamic classes (PR #75912)

[John McCall via cfe-commits]

================
@@ -1801,6 +1801,12 @@ void ItaniumCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
   if (VTable->hasInitializer())
     return;
 
+  // If the class are attached to a C++ named module other than the one
----------------
rjmccall wrote:

```suggestion
  // If the class is attached to a C++ named module other than the one
```

https://github.com/llvm/llvm-project/pull/75912