`module.map` as a module map name has been discouraged since 2014, and
Clang will soon warn on its usage. This patch renames all instances of
`module.map` in the Swift tests to `module.modulemap` in preparation
for this change to Clang.
rdar://106123303
This is necessary to ensure that we autorelease such values in objc thunks.
Previously, we were returning the value as unowned, leaking it. I added a test
to interpreter that will make sure in the future we do not leak like this
again.
rdar://45543138