bind bytecode_sort_mode as a vector, not a string
bind bytecode_sort_mode as a vector, not a string

Summary:
bytecode_sort_mode is a weird param that can be either a string OR a list of strings in json. refig will model it as a list only.

NOTE: pushing this straight into staging. basically unused right now, so very safe.

Reviewed By: minjang

Differential Revision: D15716082

fbshipit-source-id: c892171b6c21adf9a8cd69fa8236f447be5ac5be

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