miyuki added a comment.

One use case for this is debugging: this flag makes it easier to find out which 
revisions of LLVM introduce changes in codegen and/or debug information without 
having to filter out .ident/producer metadata. Some users can also use this 
flag (or an equivalent, -fno-ident) to reduce code size: 
https://github.com/niXman/mingw-builds/issues/412 (.ident strings are embedded 
into each object file and don't get merged during linking, so the difference 
can be noticeable).


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