Reland "[wasm] remove kExecuteSimdLowered mode from wasm cctest"

This is a reland of 86bc1517
Original change's description:
> [wasm] remove kExecuteSimdLowered mode from wasm cctest
> 
> R=clemensh@chromium.org,titzer@chromium.org,bbudge@chromium.org,gdeepti@chromium.org
> BUG=v8:7028
> 
> Change-Id: Ie0b984ebd18e267cdaf7aaff9f17fb4328d8e5fa
> Reviewed-on: https://chromium-review.googlesource.com/849638
> Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#50385}

Bug: v8:7028
Change-Id: I64ef0f55268d542588d69a661c0ce88b8aa2f6d5
Reviewed-on: https://chromium-review.googlesource.com/854776Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50463}

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

@@ -15,7 +15,7 @@ namespace wasm {
 
 TestingModuleBuilder::TestingModuleBuilder(
     Zone* zone, WasmExecutionMode mode,
-    compiler::RuntimeExceptionSupport exception_support)
+    compiler::RuntimeExceptionSupport exception_support, LowerSimd lower_simd)
     : test_module_ptr_(&test_module_),
       isolate_(CcTest::InitIsolateOnce()),
       global_offset(0),
@@ -24,7 +24,7 @@ TestingModuleBuilder::TestingModuleBuilder(
       interpreter_(nullptr),
       execution_mode_(mode),
       runtime_exception_support_(exception_support),
-      lower_simd_(mode == kExecuteSimdLowered) {
+      lower_simd_(lower_simd) {
   WasmJs::Install(isolate_, true);
   test_module_.globals_size = kMaxGlobalsSize;
   memset(globals_data_, 0, sizeof(globals_data_));

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

@@ -51,11 +51,11 @@ constexpr uint32_t kMaxGlobalsSize = 128;
 enum WasmExecutionMode {
   kExecuteInterpreter,
   kExecuteTurbofan,
-  kExecuteLiftoff,
-  // TODO(bug:7028): Introduce another enum for simd lowering.
-  kExecuteSimdLowered
+  kExecuteLiftoff
 };
 
+enum LowerSimd : bool { kLowerSimd = true, kNoLowerSimd = false };
+
 using compiler::CallDescriptor;
 using compiler::MachineTypeForC;
 using compiler::Node;
@@ -85,7 +85,7 @@ using compiler::Node;
 class TestingModuleBuilder {
  public:
   TestingModuleBuilder(Zone*, WasmExecutionMode,
-                       compiler::RuntimeExceptionSupport);
+                       compiler::RuntimeExceptionSupport, LowerSimd);
 
   void ChangeOriginToAsmjs() { test_module_.set_origin(kAsmJsOrigin); }
 
@@ -204,7 +204,7 @@ class TestingModuleBuilder {
 
   WasmInterpreter* interpreter() { return interpreter_; }
   bool interpret() { return interpreter_ != nullptr; }
-  bool lower_simd() { return lower_simd_; }
+  LowerSimd lower_simd() { return lower_simd_; }
   Isolate* isolate() { return isolate_; }
   Handle<WasmInstanceObject> instance_object() { return instance_object_; }
   WasmCodeWrapper GetFunctionCode(uint32_t index) {
@@ -252,7 +252,7 @@ class TestingModuleBuilder {
   NativeModule* native_module_;
   bool linked_ = false;
   compiler::RuntimeExceptionSupport runtime_exception_support_;
-  bool lower_simd_;
+  LowerSimd lower_simd_;
 
   const WasmGlobal* AddGlobal(ValueType type);
 
@@ -373,9 +373,10 @@ class WasmFunctionCompiler : public compiler::GraphAndBuilders {
 class WasmRunnerBase : public HandleAndZoneScope {
  public:
   WasmRunnerBase(WasmExecutionMode execution_mode, int num_params,
-                 compiler::RuntimeExceptionSupport runtime_exception_support)
+                 compiler::RuntimeExceptionSupport runtime_exception_support,
+                 LowerSimd lower_simd)
       : zone_(&allocator_, ZONE_NAME),
-        builder_(&zone_, execution_mode, runtime_exception_support),
+        builder_(&zone_, execution_mode, runtime_exception_support, lower_simd),
         wrapper_(&zone_, num_params) {}
 
   // Builds a graph from the given Wasm code and generates the machine
@@ -454,15 +455,20 @@ class WasmRunner : public WasmRunnerBase {
   WasmRunner(WasmExecutionMode execution_mode,
              const char* main_fn_name = "main",
              compiler::RuntimeExceptionSupport runtime_exception_support =
-                 compiler::kNoRuntimeExceptionSupport)
+                 compiler::kNoRuntimeExceptionSupport,
+             LowerSimd lower_simd = kNoLowerSimd)
       : WasmRunnerBase(execution_mode, sizeof...(ParamTypes),
-                       runtime_exception_support) {
+                       runtime_exception_support, lower_simd) {
     NewFunction<ReturnType, ParamTypes...>(main_fn_name);
     if (!interpret()) {
       wrapper_.Init<ReturnType, ParamTypes...>(functions_[0]->descriptor());
     }
   }
 
+  WasmRunner(WasmExecutionMode execution_mode, LowerSimd lower_simd)
+      : WasmRunner(execution_mode, "main", compiler::kNoRuntimeExceptionSupport,
+                   lower_simd) {}
+
   ReturnType Call(ParamTypes... p) {
     DCHECK(compiled_);
     if (interpret()) return CallInterpreter(p...);