[llvm] [RISCV] Use significant bits helpers in narrowing of build vectors [nfc] (PR #104511)

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git-clang-format --diff d68d2172f9f1f0659b8b4bdbbeb1ccd290a614b5 4992557be0140c0aa4708f74fa8f9d072ee1397b --extensions cpp -- llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 515d7dbcd4..b76ebdf715 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -3815,11 +3815,12 @@ static SDValue lowerBuildVectorOfConstants(SDValue Op, SelectionDAG &DAG,
   if (EltBitSize > 8 && VT.isInteger() &&
       (NumElts <= 4 || VT.getSizeInBits() > Subtarget.getRealMinVLen()) &&
       DAG.ComputeMaxSignificantBits(Op) <= 8) {
-    SDValue Source = DAG.getBuildVector(VT.changeVectorElementType(MVT::i8),
-                                        DL, Op->ops());
-    Source = convertToScalableVector(ContainerVT.changeVectorElementType(MVT::i8),
-                                     Source, DAG, Subtarget);
-    SDValue Res = DAG.getNode(RISCVISD::VSEXT_VL, DL, ContainerVT, Source, Mask, VL);
+    SDValue Source =
+        DAG.getBuildVector(VT.changeVectorElementType(MVT::i8), DL, Op->ops());
+    Source = convertToScalableVector(
+        ContainerVT.changeVectorElementType(MVT::i8), Source, DAG, Subtarget);
+    SDValue Res =
+        DAG.getNode(RISCVISD::VSEXT_VL, DL, ContainerVT, Source, Mask, VL);
     return convertFromScalableVector(VT, Res, DAG, Subtarget);
   }
 

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https://github.com/llvm/llvm-project/pull/104511