Commits
Joe Groff committed 185399787d0
SILGen: Reenable 'fallthrough'. Reimplement fallthrough using switch's new internal representation of case-to-BB mappings and scope management. Fallthrough can't pass control into a case block with pattern variables, so fallthrough destinations will always be at outermost switch scope, and we can assume the destination block will be emitted in that scope. Swift SVN r6197