[llvm] [WebAssembly] Support f16x8.demote_f32x4_zero (PR #193564)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
index 8f23d2a9b..6da40a7bd 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
@@ -3153,7 +3153,8 @@ performVectorTruncZeroCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI) {
     //
     // Or this:
     //
-    //   (concat_vectors ({v2f32, v4f16} (fp_round ({v2f64, v4f32} $x))), ({v2f32, v4f16} (splat 0)))
+    //   (concat_vectors ({v2f32, v4f16} (fp_round ({v2f64, v4f32} $x))),
+    //   ({v2f32, v4f16} (splat 0)))
     //
     // into ({f32x4, f16x8}.demote_zero_{f64x2, f32x4} $x).
     EVT ResVT;
@@ -3209,7 +3210,8 @@ performVectorTruncZeroCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI) {
   //
   // Or this:
   //
-  //   ({v4f32, v8f16} (fp_round (concat_vectors $x, ({v2f64, v4f32} (splat 0)))))
+  //   ({v4f32, v8f16} (fp_round (concat_vectors $x, ({v2f64, v4f32} (splat
+  //   0)))))
   //
   // into ({f32x4, f16x8}.demote_zero_{f64x2, f32x4} $x).
   EVT ResVT;
@@ -3239,8 +3241,10 @@ performVectorTruncZeroCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI) {
     return SDValue();
 
   if (ConversionOp == ISD::FP_ROUND) {
-    if (!((ConcatVT == MVT::v4f64 && SourceVT == MVT::v2f64 && ResVT == MVT::v4f32) ||
-          (ConcatVT == MVT::v8f32 && SourceVT == MVT::v4f32 && ResVT == MVT::v8f16)))
+    if (!((ConcatVT == MVT::v4f64 && SourceVT == MVT::v2f64 &&
+           ResVT == MVT::v4f32) ||
+          (ConcatVT == MVT::v8f32 && SourceVT == MVT::v4f32 &&
+           ResVT == MVT::v8f16)))
       return SDValue();
   } else {
     if (ConcatVT != MVT::v4f64 || SourceVT != MVT::v2f64 || ResVT != MVT::v4i32)

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https://github.com/llvm/llvm-project/pull/193564