Remove lldb-repro which was used to run the test suite against a
reproducer. The corresponding functionality has been removed from LLDB
so there's no need for the tool anymore.
This patch changes the implementation of Lua's `print()` function to
respect `io.stdout`.
The original implementation uses `lua_writestring()` internally, which is
hardcoded to `stdout`.
Reviewed By: JDevlieghere
Differential Revision: https://reviews.llvm.org/D90787