...and remove the option. This is ~technically~ CLI-breaking because
Swift 5 shipped this as a hidden driver option, but it wouldn't have
/done/ anything in Swift 5, so I think it's okay to remove.
Note that if a parseable interface (.swiftinterface) and a binary
interface (.swiftmodule) are both present, the binary one will still
be preferred. This just /allows/ parseable interfaces to be used.
rdar://problem/36885834
Adds a test that errors reported in the inlinable function bodies of
.swiftinterface files are propagated correctly when generating the corresponding
.swiftmodule files.
rdar://problem/44400260
Ensure that we explicitly provide the path to the interpreter when
running the python scripts during the tests. This is needed to have the
tests work on Windows which does not honour the shebang in the file. It
also ensures that we use the correct interpreter for the tests.
