Remove empty SNPrintF call to make mips build happy

test/cctest/test-cpu-profiler.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1022 matching lines @@
   i::HandleScope scope(isolate);
 
   i::EmbeddedVector<char, 512> script;
   i::EmbeddedVector<char, 64> optimize_call;
 
   const char* func_name = "func";
   if (optimize) {
     i::SNPrintF(optimize_call, "%%OptimizeFunctionOnNextCall(%s);\n",
                 func_name);
   } else {
-    i::SNPrintF(optimize_call, "");
+    optimize_call[0] = '\0';
   }
   i::SNPrintF(script,
               "function %s() {\n"
               "  var n = 0;\n"
               "  var m = 100*100;\n"
               "  while (m > 1) {\n"
               "    m--;\n"
               "    n += m * m * m;\n"
               "  }\n"
               "}\n"
@@ skipping 1037 matching lines @@
   iprofile->Print();
   v8::CpuProfile* profile = reinterpret_cast<v8::CpuProfile*>(iprofile);
 
   const char* branch[] = {"", "test"};
   const ProfileNode* itest_node =
       GetSimpleBranch(env, profile, branch, arraysize(branch));
   CHECK_EQ(0U, itest_node->deopt_infos().size());
 
   iprofiler->DeleteProfile(iprofile);
 }