[Bug 1909838] [NEW] gcc -O3 produces invalid code

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If I compile the attached file with -O3, gcc produces an empty function
(simply returns 0). If I compile without -O3, gcc produces viable code
that functions as expected.

Linux outhouse 5.4.0-58-generic #64-Ubuntu SMP Wed Dec 9 08:16:25 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux

gcc  4:9.3.0-1ubuntu2

** Affects: gcc-9 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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gcc -O3 produces invalid code
https://bugs.launchpad.net/bugs/1909838
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