Merge branch 'fix-accessing-first-syscall-argument-on-rv64'

Pu Lehui says:

====================
Fix accessing first syscall argument on RV64

On RV64, as Ilya mentioned before [0], the first syscall parameter should be
accessed through orig_a0 (see arch/riscv64/include/asm/syscall.h),
otherwise it will cause selftests like bpf_syscall_macro, vmlinux,
test_lsm, etc. to fail on RV64.

Link: https://lore.kernel.org/bpf/[email protected] [0]

v3:
- Fix test case error.

v2: https://lore.kernel.org/all/[email protected]/
- Access first syscall argument with CO-RE direct read. (Andrii)

v1: https://lore.kernel.org/all/[email protected]/
====================

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Andrii Nakryiko <[email protected]>

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