[dmd-internals] regressions, criticals, and blockers

[Walter Bright]

http://d.puremagic.com/issues/buglist.cgi?query_format=advanced&bug_severity=regression&bug_severity=blocker&bug_severity=critical&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED

69 of 'em, this is what we should be trying to tamp down