[Impeller] Delete dead code from reflector.cc (#40805)

Author: dnfield

impeller/compiler/reflector.cc

@@ -110,28 +110,6 @@ static std::string StringToShaderStage(std::string str) {
   return "ShaderStage::kUnknown";
 }
 
-static std::string StringToVkShaderStage(std::string str) {
-  if (str == "vertex") {
-    return "VK_SHADER_STAGE_VERTEX_BIT";
-  }
-  if (str == "fragment") {
-    return "VK_SHADER_STAGE_FRAGMENT_BIT";
-  }
-
-  if (str == "tessellation_control") {
-    return "VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT";
-  }
-
-  if (str == "tessellation_evaluation") {
-    return "VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT";
-  }
-
-  if (str == "compute") {
-    return "VK_SHADER_STAGE_COMPUTE_BIT";
-  }
-  return "VK_SHADER_STAGE_ALL_GRAPHICS";
-}
-
 Reflector::Reflector(Options options,
                      std::shared_ptr<const spirv_cross::ParsedIR> ir,
                      std::shared_ptr<fml::Mapping> shader_data,
@@ -410,10 +388,6 @@ std::shared_ptr<fml::Mapping> Reflector::InflateTemplate(
                    [type = compiler_.GetType()](inja::Arguments& args) {
                      return ToString(type);
                    });
-  env.add_callback(
-      "to_vk_shader_stage_flag_bits", 1u, [](inja::Arguments& args) {
-        return StringToVkShaderStage(args.at(0u)->get<std::string>());
-      });
 
   auto inflated_template =
       std::make_shared<std::string>(env.render(tmpl, *template_arguments_));