Add process_vm_readv and process_vm_writev.

Bug: http://b/21761353
Change-Id: Ic8ef3f241d62d2a4271fbc783c8af50257bac498
diff --git a/libc/arch-arm64/syscalls/process_vm_readv.S b/libc/arch-arm64/syscalls/process_vm_readv.S
new file mode 100644
index 0000000..1dd113b
--- /dev/null
+++ b/libc/arch-arm64/syscalls/process_vm_readv.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(process_vm_readv)
+    mov     x8, __NR_process_vm_readv
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno_internal
+
+    ret
+END(process_vm_readv)