[clang][NFC] Refactor replaceExternalDecls to use llvm::any_of (#143275)

This patch simplifies the declaration replacement logic in
replaceExternalDecls by replacing a manual loop with an idiomatic use of
llvm::any_of. This improves code readability and aligns with common LLVM
coding style.

Author: snarang181

clang/include/clang/AST/DeclContextInternals.h

@@ -177,13 +177,12 @@ class StoredDeclsList {
       if (ND->isFromASTFile())
         return true;
       // FIXME: Can we get rid of this loop completely?
-      for (NamedDecl *D : Decls)
+      return llvm::any_of(Decls, [ND](NamedDecl *D) {
         // Only replace the local declaration if the external declaration has
-        // higher visibilities.
-        if (D->getModuleOwnershipKind() <= ND->getModuleOwnershipKind() &&
-            D->declarationReplaces(ND, /*IsKnownNewer=*/false))
-          return true;
-      return false;
+        // higher visiblities.
+        return D->getModuleOwnershipKind() <= ND->getModuleOwnershipKind() &&
+               D->declarationReplaces(ND, /*IsKnownNewer=*/false);
+      });
     });
 
     // Don't have any pending external decls any more.