Don't run a full verifier pass in coro-splitting's private pipeline.
Don't run a full verifier pass in coro-splitting's private pipeline.

Potentially addresses rdar://49022293.

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm