[llvm] [DirectX] Fix build breaks (PR #128556)

[Damyan Pepper via llvm-commits]

================
@@ -243,6 +243,10 @@ class DXILBitcodeWriter {
   }
   void writeDIDerivedType(const DIDerivedType *N,
                           SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
+  void writeDISubrangeType(const DISubrangeType *N,
----------------
damyanp wrote:

Is this a virtual function impl?  It'd be great if this file used "override". (Probably out of scope for this change)

https://github.com/llvm/llvm-project/pull/128556