This is swift test to go with https://github.com/apple/llvm-project/pull/4118
The test is verifying that a ObjCMethod that is annotated by an APINote
is in fact getting the APINote applied. These types of APINotes are
heavily used by UIKit for instance in didMoveToParentViewController in
UIViewController.
This is the test that goes with https://github.com/apple/llvm-project/pull/4074
In the PR to apple/llvm-project we were bailing on DeclContexts that
were not isFileContext == true. This is problematic because with
C++-Interop enabled we can end up with a DeclContext that is an extern
"C". This test makes sure that the APINote is applied and that the code
from the 4074 PR no longer bails out.
