https://bugs.llvm.org/show_bug.cgi?id=41520

            Bug ID: 41520
           Summary: -Oz significantly increase binary size comparing to
                    -Os, often even -O2
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangb...@nondot.org
          Reporter: vitalyb...@google.com
                CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
                    neeil...@live.com, richard-l...@metafoo.co.uk

Here is a reproducer on one of reprocessed llvm files
https://reviews.llvm.org/D60807
Size of Oz object is 3x of Os.

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