swift234

SILGen: Remove broken Condition::exitFalse merging
We never actually invoke destructors on SIL Instructors, so the nice SILSuccessor RAII thingy in BranchInsts never kicks in to fix up predecessor lists when we erase BranchInsts. Disable the code in Condition::exitFalse that tries to merge terminated else blocks and triggers an assert because of stale predecessor info. After the break I'll look into making Instruction::eraseFromParent actually perform some sort of instruction-specific cleanup.

Swift SVN r3592