[llvm-bugs] [Bug 47496] New: Regression in use of conditional unreachable's in LLVM

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https://bugs.llvm.org/show_bug.cgi?id=47496

            Bug ID: 47496
           Summary: Regression in use of conditional unreachable's in LLVM
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Global Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: curdeius at gmail.com
                CC: llvm-bugs at lists.llvm.org

That's a regression of the issue fixed in #810, as commented there:
https://bugs.llvm.org/show_bug.cgi?id=810#c15.

It seems that the current trunk version of clang (as of 2020-09-02) does not
optimize away the call to f1 in test2 (nb. clang 9 and 10 did optimize it).
See: https://godbolt.org/z/YK13j1.

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