[clang] Performance optimizations for function effects (nonblocking attribute etc.) (PR #96844)

[Doug Wyatt via cfe-commits]

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@@ -3857,9 +3857,19 @@ void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
   }
 
   epi.ExtInfo.Profile(ID);
-  ID.AddInteger((epi.AArch64SMEAttributes << 1) | epi.HasTrailingReturn);
 
-  epi.FunctionEffects.Profile(ID);
+  unsigned EffectCount = epi.FunctionEffects.size();
+  bool HasConds = !epi.FunctionEffects.Conditions.empty();
+
+  ID.AddInteger(
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dougsonos wrote:

It was slightly measurably better to use more bits of this existing integer.

https://github.com/llvm/llvm-project/pull/96844