Support preadv2 and pwritev2 syscalls.#4066
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These were marked as UnsupportedSyscall, causing rr to expect ENOSYS. On modern kernels that support them (Linux 4.6+), the syscall succeeds and rr hits a FATAL assertion. Handle them the same way as their v1 counterparts (preadv/pwritev). Fixes rr-debugger#3193 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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These were marked as UnsupportedSyscall, causing rr to expect ENOSYS. On modern kernels that support them (Linux 4.6+), the syscall succeeds and rr hits a FATAL assertion. Handle them the same way as their v1 counterparts (preadv/pwritev).
Fixes #3193