[clang] [Clang] Consider reachability for file-scope warnings on initializers (PR #163885)

[Yanzuo Liu via cfe-commits]

================
@@ -2724,6 +2724,80 @@ static void flushDiagnostics(Sema &S, const sema::FunctionScopeInfo *fscope) {
     S.Diag(D.Loc, D.PD);
 }
 
+void sema::AnalysisBasedWarnings::FlushDiagnostics(
+    const SmallVector<clang::sema::PossiblyUnreachableDiag, 4> PUDs) {
+  for (const auto &D : PUDs)
+    S.Diag(D.Loc, D.PD);
+}
+
+void sema::AnalysisBasedWarnings::EmitPossiblyUnreachableDiags(
+    AnalysisDeclContext &AC,
+    SmallVector<clang::sema::PossiblyUnreachableDiag, 4> PUDs) {
+
+  if (PUDs.empty()) {
+    return;
+  }
----------------
zwuis wrote:

```cpp
if (PUDs.empty())
  return;
```


https://github.com/llvm/llvm-project/pull/163885