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With Semantic mode enabled, it enables IDE features such as:

- Enable helm-semantic-or-imenu to jump with Semantic instead of Imenu.

- Show function signature of current function point is inside at the
top (with global-semantic-stickyfunc-mode)

- Show function signature of current function at point at the
bottom (with global-semantic-idle-summary-mode).

- Add Srefactor for refactoring using Semantic parser framework. Bind it
  to "SPC m r".

- Load 'compile package, otherwise compilation-mode-map won't exists and
  Semantic fails to bind some key to the map and throw error.