[MIPS] Add support for thread_suspension test

src/trusted/service_runtime/arch/mips/nacl_syscall.S

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "native_client/src/trusted/service_runtime/arch/mips/sel_ldr_mips.h"
 #include "native_client/src/trusted/service_runtime/arch/mips/sel_rt.h"
 #include "native_client/src/trusted/service_runtime/nacl_config.h"
 
@@ skipping 90 matching lines @@
   sw $s1, NACL_THREAD_CONTEXT_OFFSET_S1($a0)
   sw $s2, NACL_THREAD_CONTEXT_OFFSET_S2($a0)
   sw $s3, NACL_THREAD_CONTEXT_OFFSET_S3($a0)
   sw $s4, NACL_THREAD_CONTEXT_OFFSET_S4($a0)
   sw $s5, NACL_THREAD_CONTEXT_OFFSET_S5($a0)
   sw $s6, NACL_THREAD_CONTEXT_OFFSET_S6($a0)
   sw $s7, NACL_THREAD_CONTEXT_OFFSET_S7($a0)
   sw $t8, NACL_THREAD_CONTEXT_OFFSET_T8($a0)
   sw $sp, NACL_THREAD_CONTEXT_OFFSET_STACK_PTR($a0)
   sw $fp, NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR($a0)
+DEFINE_GLOBAL_HIDDEN_IDENTIFIER(NaClSyscallSegRegsSaved):
 
   /* Restore the trusted stack */
   lw $sp, NACL_THREAD_CONTEXT_OFFSET_TRUSTED_STACK_PTR($a0)
 
   lw    $t9,%call16(NaClSyscallCSegHook)($gp)
   jalr  $t9
   nop
 
   /*
    * NaClSyscallCSegHook returned the NaClThreadContext pointer in $v0.
    * Make that the argument (in $a0) to NaClSwitch.
    */
   lw    $t9,%call16(NaClSwitch)($gp)
   jr    $t9
   move  $a0, $v0 /* delay slot */
 
   /* NOTREACHED */
 
   /*
    * If the thread returns, which must not happen, it will be halted
    * by the following instruction.
    */
 
   .word NACL_HALT_WORD