[clang] [Clang] Treat the body of an expansion statement with expansion size 0 as discarded (PR #212319)

[Oliver Hunt via cfe-commits]

================
@@ -3651,6 +3651,20 @@ static bool hasDeducedReturnType(FunctionDecl *FD) {
   return FPT->getReturnType()->isUndeducedType();
 }
 
+/// Build a return statement that is in a discarded context.
+static StmtResult BuildDiscardedReturnStmt(Sema &S, Expr *RetValExp,
+                                           SourceLocation ReturnLoc) {
+  if (RetValExp) {
----------------
ojhunt wrote:

As ever I will always prefer early return :D

https://github.com/llvm/llvm-project/pull/212319