[wasm] Add native x64 implementations for I32x4Splat, I32x4ExtractLane

src/wasm/ast-decoder.cc

Index: src/wasm/ast-decoder.cc
diff --git a/src/wasm/ast-decoder.cc b/src/wasm/ast-decoder.cc
index 0f192508ba7d47211f380a4a48c724693202638c..515c2d0da9ddfce4f27b04265e0e25f4d9d630c2 100644
--- a/src/wasm/ast-decoder.cc
+++ b/src/wasm/ast-decoder.cc
@@ -574,6 +574,8 @@ class WasmFullDecoder : public WasmDecoder {
         return builder_->Float32Constant(0);
       case kAstF64:
         return builder_->Float64Constant(0);
+      case kAstS128:
+        return builder_->DefaultS128Value();
       default:
         UNREACHABLE();
         return nullptr;
@@ -620,6 +622,9 @@ class WasmFullDecoder : public WasmDecoder {
         case kLocalF64:
           type = kAstF64;
           break;
+        case kLocalS128:
+          type = kAstS128;
+          break;
         default:
           error(pc_ - 1, "invalid local type");
           return;