[arc64] strace misidentifying some syscalls

[vineetgarc]

strace is not able to decipher some syscalls.

# strace -f ./lmbench/bin/arc64/bin/memsize 16
...
[pid    69] syscall_0x104(0xffffffffffffffff, 0x5ffffbb4, 0, 0, 0x201df0d8, 0x201df008 <unfinished ...>
...
syscall_0x71(0, 0x5ffffb18, 0, 0x8, 0x40, 0x6) = 0

0x71: clock_gettime 0x104 = wait4

vmlinux-210415-arc64-gcc-1af4ddc4b17b-lmbench.xz.log