[馃崚][cxx-interop] Correctly import fields with type NS_OPTIONS.
#66563
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Explanation: NS_OPTIONS has a different definition in ObjC/C and C++. The C++ definition makes it hard for us to match up the enum with the typedef (type). We have had to add some ugly special cases that lookup the associated enum using an attribute:
findAnonymousEnumForTypedef. We've updated most places that import types to check for this special case, but every now and again we find another edge case. Hopefully this is the last one. This patch adds this special case/lookup when we are importing the type of fields. This bug has been hitting a lot of people, see #65885 and rdar://109830715Scope: C++ interoperability
Risk: Low, changes a narrow class of API imports; uses same pattern as elsewhere to find NS_OPTIONS.
Testing: Swift unit tests.
PR: #66452