[PATCH] Improve attributes printing.

[Jordan Rose]

  For the record, always placing GNU attributes at the end isn't correct for function definitions.

  ```
  static void bad() __attribute__((cold)) {} // -Wgcc-compat

  __attribute__((cold)) static void good() {}

  static __attribute__((cold)) void okay() {}
  static void __attribute__((cold)) alsoOkay() {}
  ```

http://llvm-reviews.chandlerc.com/D395