[MIPS] Add support for thread_suspension test

src/trusted/service_runtime/arch/mips/sel_rt.c

 /*
  * 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.
  */
 
 /*
  * NaCl Secure Runtime
  */
 #include "native_client/src/include/portability_string.h"
@@ skipping 65 matching lines @@
   sig_ctx->t8          = th_ctx->t8;
   sig_ctx->t9          = 0;
   sig_ctx->k0          = 0;
   sig_ctx->k1          = 0;
   sig_ctx->global_ptr  = 0;
   sig_ctx->stack_ptr   = th_ctx->stack_ptr;
   sig_ctx->frame_ptr   = th_ctx->frame_ptr;
   sig_ctx->prog_ctr    = th_ctx->new_prog_ctr;
   sig_ctx->return_addr = 0;
 }
+
+
+void NaClSignalContextUnsetClobberedRegisters(
+    struct NaClSignalContext *sig_ctx) {
+  sig_ctx->zero        = 0;
+  sig_ctx->at          = 0;
+  sig_ctx->v0          = 0;
+  sig_ctx->v1          = 0;
+  sig_ctx->a0          = 0;
+  sig_ctx->a1          = 0;
+  sig_ctx->a2          = 0;
+  sig_ctx->a3          = 0;
+  sig_ctx->t0          = 0;
+  sig_ctx->t1          = 0;
+  sig_ctx->t2          = 0;
+  sig_ctx->t3          = 0;
+  sig_ctx->t4          = 0;
+  sig_ctx->t5          = 0;
+  sig_ctx->t9          = 0;
+  sig_ctx->k0          = 0;
+  sig_ctx->k1          = 0;
+  sig_ctx->global_ptr  = 0;
+  sig_ctx->return_addr = 0;
+}