Tidy up error suppression
Trac #15152 showed that when a flag turned an error into a warning, we were still (alas) suppressing subequent errors; includign their essential addTcEvBind. That led (rightly) to a Lint error. This patch fixes it, and incidentally tidies up an ad-hoc special case of out-of-scope variables (see the old binding for 'out_of_scope_killer' in 'tryReporters'). No test, because the problem was only shown up when turning inaccessible code into a warning.
Showing with 57 additions and 23 deletions