[llvm] [DAG] SelectionDAG::isKnownToBeAPowerOfTwo - add ISD::TRUNCATE handling and tests (PR #184365)

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``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 7b8c440f0..faad46ea5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4782,7 +4782,7 @@ bool SelectionDAG::isKnownToBeAPowerOfTwo(SDValue Val,
                                   Depth + 1);
 
   case ISD::TRUNCATE:
-    return isKnownToBeAPowerOfTwo(Val.getOperand(0), OrZero, Depth+1);
+    return isKnownToBeAPowerOfTwo(Val.getOperand(0), OrZero, Depth + 1);
   }
 
   // More could be done here, though the above checks are enough

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https://github.com/llvm/llvm-project/pull/184365