Add process_vm_readv and process_vm_writev.

Bug: http://b/21761353
Change-Id: Ic8ef3f241d62d2a4271fbc783c8af50257bac498
diff --git a/libc/arch-mips/syscalls/process_vm_readv.S b/libc/arch-mips/syscalls/process_vm_readv.S
new file mode 100644
index 0000000..22b74f0
--- /dev/null
+++ b/libc/arch-mips/syscalls/process_vm_readv.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(process_vm_readv)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_process_vm_readv
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno_internal
+    j t9
+    nop
+    .set reorder
+END(process_vm_readv)