[llvm] [LoongArch] Custom lowering for LSX vector sign extensions (PR #194325)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp llvm/lib/Target/LoongArch/LoongArchISelLowering.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
index 0ced86f53..306689584 100644
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -402,7 +402,7 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
     for (MVT VT : {MVT::v2i64, MVT::v4i32, MVT::v8i16})
       setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, VT, Custom);
     for (MVT VT : {MVT::v16i16, MVT::v8i32, MVT::v4i64, MVT::v16i32, MVT::v8i64,
-                  MVT::v16i64})
+                   MVT::v16i64})
       setOperationAction(ISD::SIGN_EXTEND, VT, Custom);
   }
 

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https://github.com/llvm/llvm-project/pull/194325