Michael Gottesman af25b6764c [swift-stage2] Point the API migrator at the correct directory when building/testing against a host toolchain. ...

This involved adding a new substitution called %api_diff_data_dir that when
building against a host toolchain, looks in the host toolchain (next to swiftc)
rather than in the resource dir. The reason why I need to do this is this allows
me to perform a stdlib stage2 build without needing to build swift itself.

The only interesting changes here are that I had to add %api_diff_data_dir to
a bunch of normal/expected tests and also add %api_diff_data_dir's length to the
offsets in rdar31892850.swift.

2021-08-12 11:50:04 -07:00

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