Sema: Update more diagnostics for @cdecl
and representability in the C language
#81519
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Update more diagnostics shared by
@objc
and@cdecl
to correctly mention C over Objective-C when appropriate. Also introduce more general diagnostics about classes and protocols being unrepresentable in C.Diagnostics about uses of enums from C aren't updated yet. They will be part of the work on
@cdecl
enums.