Ben Langmuir 1015da026e [sourcekit] Remove reference to global context from SwiftLangSupport NFC ...

While the SwiftLangSupport doesn't currently outlive the global context
it clarifies the ownership to just store the weak reference we care
about instead of referencing the owning context. In the future we may
want to ref-count the lang support, in which case we'd need to do this
to avoid a cycle anyway.

2018-09-25 14:57:32 -07:00

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