[wasm simd] Run no lowering tests for I64x2 and F64x2

Lowering does not work correctly for I64x2 and F64x2. Those tests are
guarded with X64, so it is fine, but if we remove the guard next
time, the failing tests will be confusing.

Bug: v8:8460
Change-Id: I98da0a2de1fefa8f46bdc5c0a1407973e3ed2b81
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1683928
Auto-Submit: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62494}

test/cctest/wasm/test-run-wasm-simd.cc

@@ -377,7 +377,7 @@ bool IsExtreme(float x) {
 }
 
 #if V8_TARGET_ARCH_X64
-WASM_SIMD_TEST(F64x2Splat) {
+WASM_SIMD_TEST_NO_LOWERING(F64x2Splat) {
   WasmRunner<int32_t, double> r(execution_tier, lower_simd);
   // Set up a global to hold output vector.
   double* g = r.builder().AddGlobal<double>(kWasmS128);
@@ -712,7 +712,7 @@ WASM_SIMD_TEST(F32x4Le) {
 }
 
 #if V8_TARGET_ARCH_X64
-WASM_SIMD_TEST(I64x2Splat) {
+WASM_SIMD_TEST_NO_LOWERING(I64x2Splat) {
   WasmRunner<int32_t, int64_t> r(execution_tier, lower_simd);
   // Set up a global to hold output vector.
   int64_t* g = r.builder().AddGlobal<int64_t>(kWasmS128);