[vala] (6 commits) ...vala: Set more missing source references of CodeNode instances

[Rico Tzschichholz <ricotz src gnome org>]

Summary of changes:

  9e941a9... tests: Rename invalid yield-return test to avoid conflict (*)
  ca73184... tests: Add more "type-arguments" tests to increase coverage (*)
  ac4fcff... tests: Avoid causing unrelated errors in invalid test cases (*)
  41f2e9c... parser: Don't bail parsing of yield expression on error (*)
  e71ae37... codegen: Move some errors to semantic analyzer pass (*)
  516f209... vala: Set more missing source references of CodeNode instan (*)

(*) This commit already existed in another branch; no separate mail sent