[DebugInfo] CAS built swift TU should have CASID as dwo_name for PCM #86194
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When using compilation caching, make sure the debug info emitted in the swift TU references PCM files via CASID instead of file path. This allows dsymutil and lldb to load clang modules correctly from CAS, instead of relying on file system to load the file. rdar://167054494
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When using compilation caching, make sure the debug info emitted in the swift TU references PCM files via CASID instead of file path. This allows dsymutil and lldb to load clang modules correctly from CAS, instead of relying on file system to load the file.
rdar://167054494