Jordan Rose 43bb5e4121 swift_build_sdk_interfaces.py: builds compiled modules from an SDK (#25432) ...

...by crawling it and looking for module interfaces. This is the tool
Apple is using for the "prebuilt-modules" directory in the toolchain
in Xcode.app, which avoids even a first-use cost for importing modules
from Apple SDKs as long as the SDKs haven't changed. We've been
landing changes to support this model on the compiler side, so the
tool to generate the "prebuilt" compiled modules belongs in the
compiler repo too. (In theory this could be used with open-source
toolchains as well, or for alternate SDKs.)

2019-06-17 10:29:11 -07:00

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