Alex Hoppen 7e6b5b24a4 [Driver] Don't validate arclite linking if the driver is only set up to get the swift-frontend invocation ...

If the driver is only set up to get the frontend invocation (e.g. from sourcekitd), don't validate that we can link against ARCLite because
a) we don't care about link-time when we are only interested in the frontend invocation
b) finding arclite might cause us to find clang using xcrun which in turn can cause sourcekitd to hang.

rdar://50659268

2021-03-16 23:47:50 +01:00

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