Turn vectorization on by default for linalg on tensors path (#5280)

iree/compiler/Conversion/LinalgToSPIRV/CodeGenOptionUtils.cpp

@@ -56,7 +56,8 @@ SPIRVCodegenOptions getSPIRVCodegenOptionsFromClOptions() {
   options.workgroupSize.assign(clWorkgroupSizes.begin(),
                                clWorkgroupSizes.end());
   options.tileSizes.assign(clTileSizes.begin(), clTileSizes.end());
-  options.enableVectorization = clEnableVectorization;
+  options.enableVectorization =
+      clEnableLinalgOnTensorsSPIRV || clEnableVectorization;
   options.useWorkgroupMemory = clUseWorkgroupMemory;
   options.vectorizeMemref = clVectorizeMemref;
   options.usingLinalgOnTensors = clEnableLinalgOnTensorsSPIRV;