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Add three negative test scenarios for stat-family syscalls:
- stat-enoent: SYS_STAT on nonexistent file (ENOENT)
- stat-access-enoent: SYS_ACCESS on nonexistent file (ENOENT, since
tests run as root and EACCES is bypassed)
- stat-fstat-ebadf: SYS_FSTAT on invalid fd 99999 (EBADF)
Each scenario verifies that ior captures the tracepoint on syscall
entry even when the syscall fails.
Amp-Thread-ID: https://ampcode.com/threads/T-019c81af-d01d-75db-8a92-37951fb1503c
Co-authored-by: Amp <amp@ampcode.com>
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