[wasm-simd] Prototype load32_zero and load64_zero on BE machines

Bug: v8:10713
Change-Id: I8d909ae13aecf113e1082a0f29392c169eee8aaf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2487480Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70688}

src/compiler/wasm-compiler.cc

@@ -3961,6 +3961,20 @@ Node* WasmGraphBuilder::LoadTransformBigEndian(
       result = graph()->NewNode(mcgraph()->machine()->I64x2Splat(), result);
       break;
     }
+    case LoadTransformation::kS128Load32Zero: {
+      result = graph()->NewNode(mcgraph()->machine()->S128Zero());
+      result = graph()->NewNode(
+          mcgraph()->machine()->I32x4ReplaceLane(0), result,
+          LoadMem(type, memtype, index, offset, alignment, position));
+      break;
+    }
+    case LoadTransformation::kS128Load64Zero: {
+      result = graph()->NewNode(mcgraph()->machine()->S128Zero());
+      result = graph()->NewNode(
+          mcgraph()->machine()->I64x2ReplaceLane(0), result,
+          LoadMem(type, memtype, index, offset, alignment, position));
+      break;
+    }
     default:
       UNREACHABLE();
   }