[llvm] [AArch64] xor -1 can be mvn, so make it free (PR #166014)

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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index c6838c2c0..8973bdbfd 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -446,7 +446,7 @@ InstructionCost AArch64TTIImpl::getIntImmCostInst(unsigned Opcode, unsigned Idx,
   case Instruction::Xor:
     if (Idx == 1 && (BitSize == 32 || BitSize == 64) && Imm.isAllOnes())
       return TTI::TCC_Free; // xor a, -1 can be folded to MVN
-  [[fallthrough]];
+    [[fallthrough]];
   case Instruction::Add:
   case Instruction::Sub:
   case Instruction::Mul:

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https://github.com/llvm/llvm-project/pull/166014