[Bug ipa/68148] Devirtualization only applies to last of multiple successive calls

[matt at godbolt dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68148

--- Comment #2 from Matt Godbolt <matt at godbolt dot org> ---
That would make sense for my second observation; but if it's a per-call thing
why is only one of the calls speculatively devirtualized?