[clang] Use *Set::insert_range (NFC) (#133357)

We can use *Set::insert_range to collapse:

  for (auto Elem : Range)
    Set.insert(E);

down to:

  Set.insert_range(Range);

In some cases, we can further fold that into the set declaration.

1 files changed, 2 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 12a8894..5a4fa97 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -14731,9 +14731,8 @@ static bool isLayoutCompatibleStruct(const ASTContext &C, const RecordDecl *RD1,
 /// (C++11 [class.mem] p18)
 static bool isLayoutCompatibleUnion(const ASTContext &C, const RecordDecl *RD1,
                                     const RecordDecl *RD2) {
-  llvm::SmallPtrSet<const FieldDecl *, 8> UnmatchedFields;
-  for (auto *Field2 : RD2->fields())
-    UnmatchedFields.insert(Field2);
+  llvm::SmallPtrSet<const FieldDecl *, 8> UnmatchedFields(llvm::from_range,
+                                                          RD2->fields());
 
   for (auto *Field1 : RD1->fields()) {
     auto I = UnmatchedFields.begin();