[llvm-bugs] [Bug 43167] New: Bad unwind info on aarch64-windows with 9.0.0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43167

            Bug ID: 43167
           Summary: Bad unwind info on aarch64-windows with 9.0.0
           Product: new-bugs
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: hans at chromium.org, htmldeveloper at gmail.com,
                    llvm-bugs at lists.llvm.org
            Blocks: 42474

With the 9.0.0 release candidates, Firefox builds for aarch64-windows have bad
unwind info for a specific function (`xul!CallJSNative` as inlined into
`xul!js::InternalCallOrConstruct`) that breaks the OS's ability to unwind and
reach our crash reporter.

This doesn't happen with 8.0.0.

I will attempt to bisect and/or reduce this, but I can only reproduce this with
LTO and PGO enabled, which makes for a very slow build and means it may take a
long time.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=42474
[Bug 42474] [meta] 9.0.0 Release Blockers
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