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

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@@ -1128,12 +1128,18 @@ def ThreadSafetyBeta : DiagGroup<"thread-safety-beta">;
 // Uniqueness Analysis warnings
 def Consumed       : DiagGroup<"consumed">;
 
+// Warnings and notes related to the function effects system underlying
+// the nonblocking and nonallocating attributes.
+def FunctionEffects : DiagGroup<"function-effects">;
+def PerfConstraintImpliesNoexcept : DiagGroup<"perf-constraint-implies-noexcept">;
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Sirraide wrote:

Or maybe `-Wextra` since it’s a bit niche, but I don’t feel too strongly about this.

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