[Bug lto/91988] Inlining fails with LTO enabled

[gcc-bugzilla at tobias dot goedderz.info]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91988

--- Comment #1 from Tobias Gödderz <gcc-bugzilla at tobias dot goedderz.info> 
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Happens with GCC 9.1.0 as well.