RemoteAST: Try to fix a use-after-free in swift-remoteast-test #22792
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Fixes <rdar://problem/48067187>. We keep a global context alive now, but we have to destroy it before Swift's ASTContext is torn down.
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Fixes rdar://problem/48067187.
We keep a global context alive now, but we have to destroy it before
Swift's ASTContext is torn down.