[wasm-simd][scalar-lowering] Fix lowering on kS128Const

kFloat32x4 needs to handle the endianness similar to kInt32x4.

Change-Id: Iaab2d6785d56c06fd00654bff174900550db9e47
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2411628Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#69897}

src/compiler/simd-scalar-lowering.cc

@@ -1239,7 +1239,8 @@ void SimdScalarLowering::LowerNode(Node* node) {
           float val[kNumLanes32];
           memcpy(val, params.data(), kSimd128Size);
           for (int i = 0; i < num_lanes; ++i) {
-            rep_node[i] = mcgraph_->Float32Constant(val[i]);
+            rep_node[i] = mcgraph_->Float32Constant(
+                base::ReadLittleEndianValue<float>(&val[i]));
           }
           break;
         }