[llvm] Reland "[AArch64] AArch64TargetLowering::computeKnownBitsForTargetNode - add support for AArch64ISD::MOV/MVN constants" (PR #155696)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp llvm/unittests/Target/AArch64/AArch64SelectionDAGTest.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 726515429..9570156db 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -2623,15 +2623,13 @@ void AArch64TargetLowering::computeKnownBitsForTargetNode(
   case AArch64ISD::MOVIshift: {
     auto ShiftAmt = AArch64_AM::getShiftValue(Op->getConstantOperandVal(1));
     Known = KnownBits::makeConstant(
-        APInt(Known.getBitWidth(), Op->getConstantOperandVal(0)
-                                       << ShiftAmt));
+        APInt(Known.getBitWidth(), Op->getConstantOperandVal(0) << ShiftAmt));
     break;
   }
   case AArch64ISD::MOVImsl: {
     auto ShiftAmt = AArch64_AM::getShiftValue(Op->getConstantOperandVal(1));
-    Known = KnownBits::makeConstant(
-        APInt(Known.getBitWidth(), ~(~Op->getConstantOperandVal(0)
-                                     << ShiftAmt)));
+    Known = KnownBits::makeConstant(APInt(
+        Known.getBitWidth(), ~(~Op->getConstantOperandVal(0) << ShiftAmt)));
     break;
   }
   case AArch64ISD::MOVIedit: {
@@ -2643,16 +2641,14 @@ void AArch64TargetLowering::computeKnownBitsForTargetNode(
   case AArch64ISD::MVNIshift: {
     auto ShiftAmt = AArch64_AM::getShiftValue(Op->getConstantOperandVal(1));
     Known = KnownBits::makeConstant(
-        APInt(Known.getBitWidth(),
-              ~(Op->getConstantOperandVal(0) << ShiftAmt),
+        APInt(Known.getBitWidth(), ~(Op->getConstantOperandVal(0) << ShiftAmt),
               /*isSigned*/ false, /*implicitTrunc*/ true));
     break;
   }
   case AArch64ISD::MVNImsl: {
     auto ShiftAmt = AArch64_AM::getShiftValue(Op->getConstantOperandVal(1));
     Known = KnownBits::makeConstant(
-        APInt(Known.getBitWidth(),
-              (~Op->getConstantOperandVal(0) << ShiftAmt),
+        APInt(Known.getBitWidth(), (~Op->getConstantOperandVal(0) << ShiftAmt),
               /*isSigned*/ false, /*implicitTrunc*/ true));
     break;
   }

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https://github.com/llvm/llvm-project/pull/155696