Download and use 64-bit dep graph when enabled
Summary:
When instructed to do so, download and use the 64-bit saved state from the hack XDB.
hh_server will download 64-bit saved-states to the same directory structure but with a `_64bit` suffix, e.g. `/tmp/hh_server/hh_saved_states_sql/global_XXXX_64bit`
- Currently, when in 64-bit mode, we bypass devinfra's naming table, because I am not sure it's made for the same revision as the dep graph. We thus fall back to the legacy naming table blob.
- Informant monitor pre-downloading is disabled, and thus I've not bothered to support 64-bit in this scenario yet.
- `xdb_bin.ml` is also not yet supported, I have no idea where that's used.
Reviewed By: ljw1004
Differential Revision:
D24190440
fbshipit-source-id:
e65f0b74e6c68a4c6452b1a46f9e8f8762fd696e