Revert runtime lowering of wasm SIMD ops

test/mjsunit/wasm/test-wasm-simd-ops.js

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --expose-wasm --wasm-simd-prototype --wasm-num-compilation-tasks=0
-
-load('test/mjsunit/wasm/wasm-constants.js');
-load('test/mjsunit/wasm/wasm-module-builder.js');
-
-// TODO(gdeepti): Currently wasm simd ops are tested using runtime calls to
-// JS runtime functions, as this needs heap allocation sequential compile is
-// triggered here. This is only used for bootstrapping and needs to be removed
-// when we have architectuaral/scalar implementations for wasm simd ops.
-
-(function SimdSplatExtractTest() {
-  var module = new WasmModuleBuilder();
-  module.addFunction("splatextract", kSig_i_ii)
-      .addBody([kExprGetLocal, 0, kExprSimdPrefix, kExprI32x4Splat,
-          kExprI32Const, 1, kExprSimdPrefix, kExprI32x4ExtractLane])
-      .exportAs("main");
-  var instance = module.instantiate();
-  assertEquals(123, instance.exports.main(123, 2));
-})();