Xi Ge 90f59e4336 TBDGen: teach the compiler to take a json file indicating previous install names ...

Using the new linker directives $ld$previous requires the compiler to know the previous
install names for the symbols marked as removed. This patch teaches the compiler
to take a path to a Json file specifying the map between module names and previous
install names. Also, these install names can be platform-specific.

Progress towards: rdar://58281536

2020-01-13 17:45:40 -08:00

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