Sema: add support for __attribute__((__swift_newtype__))
#1833
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Add the
swift_newtype
attribute which allows a type definition to beimported into Swift as a new type. The imported type must be either an
enumerated type (enum) or an object type (struct).
This is based on the work of the original changes in
llvm/llvm-project-staging@8afaf3a
Pre-apply upstream patch for
swift_newtype
.