fix: wrong bit-width on PerformNeonTruncateMinMaxCombine::IsUnsignedSaturate

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+**/cmake-build*
 
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llvm/lib/Target/ARM/ARMISelLowering.cpp

 //===- ARMISelLowering.cpp - ARM DAG Lowering Implementation --------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
static SDValue PerformNeonTruncateMinMaxCombine(SDNode *N, SelectionDAG &DAG,
 
   auto IsUnsignedSaturate = [&](SDNode *Min) {
     // For unsigned, we just need to check for <= 0xffff
     if (Min->getOpcode() != ISD::UMIN)
       return false;
 
     APInt SaturateC;
     if (VT == MVT::v8i8)
-      SaturateC = APInt(8, (1 << 8) - 1, true);
+      SaturateC = APInt(16, (1 << 8) - 1, true);
     else // if (VT == MVT::v4i16)
-      SaturateC = APInt(16, (1 << 16) - 1, true);
+      SaturateC = APInt(32, (1 << 16) - 1, true);
 
     APInt MinC;
     if (!ISD::isConstantSplatVector(Min->getOperand(1).getNode(), MinC) ||
         MinC != SaturateC)
       return false;
     return true;
   };