[llvm] [LowerAllowCheckPass] fix pipeline printing (PR #146000)

[Vitaly Buka via llvm-commits]

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@@ -182,11 +182,13 @@ void LowerAllowCheckPass::printPipeline(
   // correctness.
   // TODO: print shorter output by combining adjacent runs, etc.
   int i = 0;
+  bool printed = false;
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vitalybuka wrote:

`join(map_range(make_filter_range))`

https://github.com/llvm/llvm-project/pull/146000