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

[Chuanqi Xu via cfe-commits]

================
@@ -1830,6 +1830,9 @@ void ItaniumCXXABI::emitVTableDefinitions(CodeGenVTables 
&CGVT,
   if (VTable->hasInitializer())
     return;
 
+  if (RD->shouldEmitInExternalSource())
+    return;
----------------
ChuanqiXu9 wrote:

Got it. If it is primarily for optimizations, I guess it might not be a 
blocker. I'll add a FIXME later.

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