[cherry-pick][DebugInfo] Fix handling of @_originallyDefinedIn types #78271
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Emit an imported declaration for @_originallyDefinedIn under the real module that these types live in.
This patch also changes the mangling for the debugger to respect @_originallyDefinedIn, and fixes a bug where @_originallyDefinedIn that should be ignored was still being used when mangling.
rdar://137146961
(cherry picked from commit f8d20c490868cbb5e6fbb82e9dcc51131ed6b5db)