swift

90622711 - SILGen: Skip SIL verification and optimization if errors were emitted.

SILGen: Skip SIL verification and optimization if errors were emitted. In lazy typechecking mode, errors in the program may only be discovered during SILGen, which can leave the SIL in a bad state for subsequent stages of compilation. If errors were detected, skip SIL verification and optimization to prevent knock-on failures. Partially reverts https://github.com/swiftlang/swift/pull/75428, which included a more targeted fix for one of the possible knock-on effects of bad SIL coming out of SILGen. Resolves rdar://132107752.