[llvm-bugs] [Bug 44456] New: Assertion failure / segfault when internalizing twice-promoted global value

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https://bugs.llvm.org/show_bug.cgi?id=44456

            Bug ID: 44456
           Summary: Assertion failure / segfault when internalizing
                    twice-promoted global value
           Product: new-bugs
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: tmandry at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

I get "llvm::thinLTOInternalizeModule ... Assertion `GS !=
DefinedGlobals.end()' failed" consistently when compiling a particular Rust
crate.

This happens when handling the following symbol name:

switch.table._ZN77_$LT$omaha_client..protocol..request..Event$u20$as$u20$core..clone..Clone$GT$5clone17h829b64c9ab982ff5E.llvm.10390335839252477638.llvm.11308644296266801080

Note that this has _two_ .llvm extensions appended.

getOriginalNameBeforePromote chops off both extensions instead of only the last
one.

Changing getOriginalNameBeforePromote to only chop off the last one (with
rsplit instead of split) fixes the issue.

I do not yet have a simple reproducer. I'm hoping this is clearly a bug without
one, but if not I can get one ready.

See also https://github.com/rust-lang/rust/issues/67855

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