[clang] [Clang] strengthen checks for 'main' function to meet [basic.start.main] p3 requirements (PR #101853)

[Oleksandr T. via cfe-commits]

================
@@ -7353,6 +7353,15 @@ void emitReadOnlyPlacementAttrWarning(Sema &S, const 
VarDecl *VD) {
   }
 }
 
+static bool isMainVar(DeclarationName Name, VarDecl *VD) {
+  if (Name.getAsIdentifierInfo() && Name.getAsIdentifierInfo()->isStr("main") 
&&
+      !VD->getDescribedVarTemplate()) {
+    const DeclContext *DC = VD->getDeclContext();
+    return DC->getRedeclContext()->isTranslationUnit() || DC->isLinkageSpec();
----------------
a-tarasyuk wrote:

@Sirraide Changed to `isExternC()`

https://github.com/llvm/llvm-project/pull/101853
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