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

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index eaa5b6fec6e2202b476c299589bb5a6863e24c94..45929b34dd846782097b260561047314ebde42df 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -3348,8 +3348,10 @@ SourcePositionTable* WasmCompilationUnit::BuildGraphForWasmFunction(
     r.LowerGraph();
   }
 
-  SimdScalarLowering(graph, machine, common, jsgraph_->zone(), function_->sig)
-      .LowerGraph();
+  if (!CpuFeatures::SupportsSimd128()) {
+    SimdScalarLowering(graph, machine, common, jsgraph_->zone(), function_->sig)
+        .LowerGraph();
+  }
 
   int index = static_cast<int>(function_->func_index);