[clang] [clang] Disable missing definition warning on pure virtual functions (PR #74510)

[Shafik Yaghmour via cfe-commits]

================
@@ -18931,7 +18931,7 @@ void Sema::MarkFunctionReferenced(SourceLocation Loc, 
FunctionDecl *Func,
   //   constant evaluated
   bool NeededForConstantEvaluation =
       isPotentiallyConstantEvaluatedContext(*this) &&
-      isImplicitlyDefinableConstexprFunction(Func);
+      isImplicitlyDefinableConstexprFunction(Func) && !Func->isPure();
----------------
shafik wrote:

Thank to @erichkeane I realized I am wrong, we can actually define a pure 
virtual function. So we do want to retain the diagnostic here.

https://github.com/llvm/llvm-project/pull/74510
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