[wasm-simd] Remove ScalarLoweringForTesting

Bug: v8:11613
Change-Id: Ib1ad2dc7bb7235b5f8ef5068a5d3175556d1a65b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2806547Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73841}

src/compiler/wasm-compiler.cc

@@ -4533,13 +4533,6 @@ void WasmGraphBuilder::LowerInt64(CallOrigin origin) {
   LowerInt64(CreateMachineSignature(mcgraph()->zone(), sig_, origin));
 }
 
-void WasmGraphBuilder::SimdScalarLoweringForTesting() {
-  SimdScalarLowering(
-      mcgraph(), gasm_->simplified(),
-      CreateMachineSignature(mcgraph()->zone(), sig_, kCalledFromWasm))
-      .LowerGraph();
-}
-
 void WasmGraphBuilder::SetSourcePosition(Node* node,
                                          wasm::WasmCodePosition position) {
   DCHECK_NE(position, wasm::kNoCodePosition);

src/compiler/wasm-compiler.h

@@ -408,8 +408,6 @@ class WasmGraphBuilder {
   V8_EXPORT_PRIVATE void LowerInt64(Signature<MachineRepresentation>* sig);
   V8_EXPORT_PRIVATE void LowerInt64(CallOrigin origin);
 
-  V8_EXPORT_PRIVATE void SimdScalarLoweringForTesting();
-
   void SetSourcePosition(Node* node, wasm::WasmCodePosition position);
 
   Node* S128Zero();

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

@@ -379,9 +379,6 @@ void TestBuildingGraphWithBuilder(compiler::WasmGraphBuilder* builder,
           result.error().message().c_str());
   }
   builder->LowerInt64(compiler::WasmGraphBuilder::kCalledFromWasm);
-  if (!CpuFeatures::SupportsWasmSimd128()) {
-    builder->SimdScalarLoweringForTesting();
-  }
 }
 
 void TestBuildingGraph(Zone* zone, compiler::JSGraph* jsgraph,