[llvm-bugs] [Bug 35722] New: [ThinLTO] asserts `!(Pair.first != Ty && Pair.second == Ty) && "mapping to a source type"`

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35722

            Bug ID: 35722
           Summary: [ThinLTO] asserts `!(Pair.first != Ty && Pair.second
                    == Ty) && "mapping to a source type"`
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Linker
          Assignee: unassignedbugs at nondot.org
          Reporter: paul_robinson at playstation.sony.com
                CC: llvm-bugs at lists.llvm.org

Using the legacy LTO API (which PS4 does) we get this crash with
r321174; it works with r319985.

See attachment for repro and the crash log.

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