unix: add support for ptrace on macOS/ARM64

Same as CL 260718 did for package syscall.

Updates golang/go#38485

Change-Id: I7b282b7c823dd79eb1fe8b172a78da8dfe9acd1c
Reviewed-on: https://go-review.googlesource.com/c/sys/+/262957
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/unix/zsyscall_darwin_arm64.s b/unix/zsyscall_darwin_arm64.s
index 16aebee..53c402b 100644
--- a/unix/zsyscall_darwin_arm64.s
+++ b/unix/zsyscall_darwin_arm64.s
@@ -282,6 +282,8 @@
 	JMP	libc_getfsstat(SB)
 TEXT ·libc_lstat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_lstat(SB)
+TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
+	JMP	libc_ptrace(SB)
 TEXT ·libc_stat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_stat(SB)
 TEXT ·libc_statfs_trampoline(SB),NOSPLIT,$0-0