fix folly::fibers GDB extension for GCC 9
Summary: The folly::fibers GDB extension, specifically the `info fibers` command, depended on a specific format of the std::unique_ptr pretty printer output. This pretty printer format changed between GCC 7 and GCC 9, with the latter omitting the target address. However, the new pretty printer does expose an iterator for the child target address that we can use instead. Differential Revision: D23063364 fbshipit-source-id: 6125edaba9abcfd0b7a9c0741a18854637c97804
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