[clang] nonblocking/nonallocating attributes: 2nd pass caller/callee analysis (PR #99656)

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@@ -4914,6 +4920,78 @@ class FunctionEffectsRef {
   void dump(llvm::raw_ostream &OS) const;
 };
 
+/// A mutable set of FunctionEffect::Kind.
+class FunctionEffectKindSet {
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Sirraide wrote:

Is there a way to use `std::bitset` to simplify the implementation of this and/or use `llvm::map_range` for the iterator? Just thinking of ways you can avoid having to implement e.g. iterators for this yourself because this code feels like it should already exist somewhere else.

https://github.com/llvm/llvm-project/pull/99656