This flag makes the linker bind default-visibility functions locally, so
that calls to them do not have to go through the PLT. This makes it
impossible to override them by preloading a DSO. This was already the
case partially due to `-fno-semantic-interposition`, however that flag
is only able to optimize call sites that are in the same Translation
Unit as the function definitions.
This removes 80% of the PLT relocations in `libjs.so.serenity`.
Obsoletes #20877
6fd8f9ea51