Add process_vm_readv and process_vm_writev.

Bug: http://b/21761353
Change-Id: Ic8ef3f241d62d2a4271fbc783c8af50257bac498
diff --git a/libc/arch-x86_64/syscalls/process_vm_readv.S b/libc/arch-x86_64/syscalls/process_vm_readv.S
new file mode 100644
index 0000000..597649e
--- /dev/null
+++ b/libc/arch-x86_64/syscalls/process_vm_readv.S
@@ -0,0 +1,16 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(process_vm_readv)
+    movq    %rcx, %r10
+    movl    $__NR_process_vm_readv, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno_internal
+1:
+    ret
+END(process_vm_readv)