Fix double delete (from RSExportable during teardown).

I should not have attempted to delete the storage in this case. At this point
in compilation, we have already appended it to a list of objects to be cleaned
up. This results in a mistaken double deletion of the same object, which in
turn causes the compiler to seg fault (instead of terminating nicely).

Change-Id: I479153e146ef3ed3a5c728494c35d7d2b75fc292
3 files changed