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

[Erich Keane via cfe-commits]

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@@ -4932,6 +4938,78 @@ class FunctionEffectsRef {
   void dump(llvm::raw_ostream &OS) const;
 };
 
+/// A mutable set of FunctionEffect::Kind.
+class FunctionEffectKindSet {
+  // For now this only needs to be a bitmap.
+  constexpr static size_t EndBitPos = 8;
+  using KindBitsT = std::bitset<EndBitPos>;
+
+  KindBitsT KindBits{};
+
+  explicit FunctionEffectKindSet(KindBitsT KB) : KindBits(KB) {}
+
+  constexpr static size_t kindToPos(FunctionEffect::Kind K) {
+    return size_t(K);
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erichkeane wrote:

Oh, woops.  `static_cast` not `static_assert` :) 

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