[llvm] [TableGen] Emit `llvm::is_contained` when CheckOpcode accepts a large list (PR #134057)

[Matt Arsenault via llvm-commits]

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@@ -152,6 +152,18 @@ void PredicateExpander::expandCheckOpcode(raw_ostream &OS,
     return;
   }
 
+  if (Opcodes.size() >= 8) {
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arsenm wrote:

Is this an experimentally determined number? Does it hurt to just always do this? 

https://github.com/llvm/llvm-project/pull/134057