which makes stack prot correct for not main threads created by binaries with statically linked libthr.
Cache result, but do not engage into full double-checked locking, since calculation of the return value is idempotent.
PR: 252549
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Looks good to me.
I wondered if we want to keep the calculated stack prot to avoid iterating over the phdrs for each created thread but the value seems limited, simplicity is probably better.