Add convenience load methond for forward. (#5446)

Summary:
Pull Request resolved: #5446

People write `module->load_method("forward")` too often, let's simplify that a bit.

Reviewed By: kirklandsign

Differential Revision: D62906055

fbshipit-source-id: d45934a27c61fd0ea644e6b58a21116dbc02fa17
(cherry picked from commit b14dea8)

extension/module/module.h

@@ -44,6 +44,7 @@ class Module {
    *
    * @param[in] file_path The path to the ExecuTorch program file to load.
    * @param[in] load_mode The loading mode to use.
+   * @param[in] event_tracer A EventTracer used for tracking and logging events.
    */
   explicit Module(
       const std::string& file_path,
@@ -132,13 +133,28 @@ class Module {
    * needed. The loaded method is cached to reuse the next time it's executed.
    *
    * @param[in] method_name The name of the method to load.
+   * @param[in] event_tracer A EventTracer used for tracking and logging events.
    *
    * @returns An Error to indicate success or failure.
    */
   ET_NODISCARD
   runtime::Error load_method(
       const std::string& method_name,
-      torch::executor::EventTracer* tracer = nullptr);
+      torch::executor::EventTracer* event_tracer = nullptr);
+
+  /**
+   * Load the 'forward' method from the program and set up memory management if
+   * needed. The loaded method is cached to reuse the next time it's executed.
+   *
+   * @param[in] event_tracer An event tracer used for tracking and logging
+   * events.
+   *
+   * @returns An Error to indicate success or failure.
+   */
+  ET_NODISCARD inline runtime::Error load_forward(
+      torch::executor::EventTracer* event_tracer = nullptr) {
+    return load_method("forward", event_tracer);
+  }
 
   /**
    * Checks if a specific method is loaded.