This is the sample project created by Todd Fiala in https://bugs.swift.org/browse/SR-2660, updated to work with modern Swift 4.
To use this yourself, modify build.sh and/or build-driver.sh such that
SWIFTC, SWIFT_SDK, SWIFT_LIB, CLANG, LLDB point to appropriate
locations on your host machine, then run build.sh. Keep in mind that, if
using an apple/swift and apple/swift-lldb built from source, they will
need to point to revisions that match each other's .swiftmodule format.