[5.5] PrebuiltModuleGen: check if an interface is for macabi by reading interface contents #856
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Explanation: Previously, we were using the file name to infer whether an interface is for macabi.
However, this seems to be inaccurate because some macabi interfaces don't have "-macabi" in
the file names. This patch teaches the driver to open interface files and check
module target specifically.
Scope: Swift prebuilt module generation
Risk: Very low
Testing: regression test added
Reviewed by: @xymus
Cherry-pick of: #855