[llvm] [AArch64] recognise trn1/trn2 with flipped operands (PR #169858)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp llvm/lib/Target/AArch64/AArch64PerfectShuffle.h llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64PerfectShuffle.h b/llvm/lib/Target/AArch64/AArch64PerfectShuffle.h
index 9ffb83577..e6fa2ae72 100644
--- a/llvm/lib/Target/AArch64/AArch64PerfectShuffle.h
+++ b/llvm/lib/Target/AArch64/AArch64PerfectShuffle.h
@@ -6720,9 +6720,9 @@ inline bool isTRNMask(ArrayRef<int> M, unsigned NumElts,
       unsigned EvenElt = (unsigned)M[i];
       if (EvenElt != i)
         Variant0Order0 = false;
-      if (EvenElt != i+1)
+      if (EvenElt != i + 1)
         Variant1Order0 = false;
-      if (EvenElt != NumElts + i )
+      if (EvenElt != NumElts + i)
         Variant0Order1 = false;
       if (EvenElt != NumElts + i + 1)
         Variant1Order1 = false;

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https://github.com/llvm/llvm-project/pull/169858