[wasm] Implement 128-bit endian swap for simd type

src/compiler/simd-scalar-lowering.h

Index: src/compiler/simd-scalar-lowering.h
diff --git a/src/compiler/simd-scalar-lowering.h b/src/compiler/simd-scalar-lowering.h
index 70186fdf11d4283868f8215bbab12e4908428493..9c6766c6ba77afe98bf46e365eb793be43cdec59 100644
--- a/src/compiler/simd-scalar-lowering.h
+++ b/src/compiler/simd-scalar-lowering.h
@@ -33,6 +33,11 @@ class SimdScalarLowering {
   static const int kMaxLanes = 4;
   static const int kLaneWidth = 16 / kMaxLanes;
 
+#if defined(V8_TARGET_BIG_ENDIAN)
+  static constexpr int kLaneOffsets[4] = {3, 2, 1, 0};
+#else
+  static constexpr int kLaneOffsets[4] = {0, 1, 2, 3};
+#endif
   struct Replacement {
     Node* node[kMaxLanes];
     SimdType type;  // represents what input type is expected