[llvm] [RISCV] Prefer vmv.s.x for build_vector a, undef, ..., undef (PR #136164)

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 52c8bdfd9..de71f00c2 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -4213,12 +4213,12 @@ static SDValue lowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
     // pressure at high LMUL.
     if (all_of(Op->ops().drop_front(),
                [](const SDUse &U) { return U.get().isUndef(); })) {
-      unsigned Opc = VT.isFloatingPoint() ? RISCVISD::VFMV_S_F_VL
-        : RISCVISD::VMV_S_X_VL;
+      unsigned Opc =
+          VT.isFloatingPoint() ? RISCVISD::VFMV_S_F_VL : RISCVISD::VMV_S_X_VL;
       if (!VT.isFloatingPoint())
         Splat = DAG.getNode(ISD::ANY_EXTEND, DL, XLenVT, Splat);
-      Splat =
-        DAG.getNode(Opc, DL, ContainerVT, DAG.getUNDEF(ContainerVT), Splat, VL);
+      Splat = DAG.getNode(Opc, DL, ContainerVT, DAG.getUNDEF(ContainerVT),
+                          Splat, VL);
       return convertFromScalableVector(VT, Splat, DAG, Subtarget);
     }
 

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https://github.com/llvm/llvm-project/pull/136164