[Bug libc/31042] [s390x] .init and .fini padding

["rui314 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31042

--- Comment #5 from Rui Ueyama <rui314 at gmail dot com> ---
> If GNU LD needs to add padding bytes due to e.g. the alignment requirement in crtn, it also uses the nops for such a code-section.
> mold should also use this behavior in order to be equal to GNU LD. Otherwise this breaks also other stuff.

That's correct; that's our approach in mold. That said, it might be a better
idea to eliminate the dependency on that behavior from the hand-written
assembly source files, as it's an obscure dependency on the implementation's
behavior. This also inadvertently creates free NOP slides for attackers. On
other platforms, we fill gaps with trap instructions, ensuring that the program
is immediately terminated if its control reaches an unexpected location.

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