[simd] Disable Simd Scalar lowering for x64, enable tests for all other architectures.

test/cctest/wasm/wasm-run-utils.h

 // 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.
 
 #ifndef WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 289 matching lines @@
 
     ptrdiff_t pc = result.error_pc - result.start;
     ptrdiff_t pt = result.error_pt - result.start;
     std::ostringstream str;
     str << "Verification failed: " << result.error_code << " pc = +" << pc;
     if (result.error_pt) str << ", pt = +" << pt;
     str << ", msg = " << result.error_msg.get();
     FATAL(str.str().c_str());
   }
   builder.Int64LoweringForTesting();
-  builder.SimdScalarLoweringForTesting();
+  if (!CpuFeatures::SupportsSimd128()) {
+    builder.SimdScalarLoweringForTesting();
+  }
 }
 
 template <typename ReturnType>
 class WasmFunctionWrapper : public HandleAndZoneScope,
                             private GraphAndBuilders {
  public:
   WasmFunctionWrapper()
       : GraphAndBuilders(main_zone()),
         inner_code_node_(nullptr),
         signature_(nullptr) {
@@ skipping 471 matching lines @@
 // interpreter.
 #define WASM_EXEC_TEST(name)                                               \
   void RunWasm_##name(WasmExecutionMode execution_mode);                   \
   TEST(RunWasmCompiled_##name) { RunWasm_##name(kExecuteCompiled); }       \
   TEST(RunWasmInterpreted_##name) { RunWasm_##name(kExecuteInterpreted); } \
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 }  // namespace
 
 #endif