================
@@ -7326,11 +7326,13 @@ void 
ItaniumMangleContextImpl::mangleCXXCtorVTable(const CXXRecordDecl *RD,
                                                    raw_ostream &Out) {
   // <special-name> ::= TC <type> <offset number> _ <base type>
   CXXNameMangler Mangler(*this, Out);
+  QualType RDType = getASTContext().getRecordType(RD);
+  QualType TypeType = getASTContext().getRecordType(Type);
   Mangler.getStream() << "_ZTC";
-  Mangler.mangleNameOrStandardSubstitution(RD);
+  Mangler.mangleType(RDType);
----------------
mizvekov wrote:

Yes, although as I said before, there should be no observable change for these 
other users, as we don't perform other manglings either before or after calling 
`mangleNameOrStandardSubstitution`.

I would prefer the ergonomics of a function which takes a CXXRecordDecl. 
MangleType is also more complex and  will perform a bunch of checks which are 
not necessary if you only would ever have a RecordType, so there is also some 
aspect of micro-optimization and ease of debugging in having a specialized 
function.

https://github.com/llvm/llvm-project/pull/109970
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