Merge changes Ib62b19c1,I80a6ecd8,I37b9aa96,I4de409b3

* changes:
  c2a: Clean-up no-ops with 'pass'
  c2a: Crate: Don't parse -Wclippy, -D, and -W flags
  c2a: Crate: Parse unquoted rustc args
  c2a: Extend unquote() to single quotes