* [cxx-interop] Add Hashable conformance to imported enums
Previously, imported enums only conformed to RawRepresentable and Equatable,
so they could not be used as members of a Set or keys of a Dictionary.
This patch adds Hashable conformance to give them that ability,
as well as some test cases to clarify the expected behavior.
Existing test cases are updated to reflect this new conformance.
rdar://129713687
If possible, add imported members to the StructDecl's LookupTable rather than adding them directly as members. This will fix the issues with ordering that #39436 poorly attempted to solve during IRGen.
This also allows us to break out most of the test changes from #39436.
Simply treat scoped enums as (pre-existing) "non frozen enums". C++
scoped enums are actually imported as Swift enums (unlike other enums)
and no global variables need be created (given their "scoped" nature).
This is a small fix to prevent a crash. This change simply adds another
condition for the "bool" branch that checks if "type" is associated with
a "clang::EnumDecl" with an underlying type of "bool", and if so, treats
"type" as a "Bool".
