Remove empty SNPrintF call to make mips build happy

test/cctest/test-cpu-profiler.cc

Index: test/cctest/test-cpu-profiler.cc
diff --git a/test/cctest/test-cpu-profiler.cc b/test/cctest/test-cpu-profiler.cc
index 34a29b39ca959cd52bff3025b8e400a0c85e4d6e..2f92f54d37414fc9cba3de863db36987f619f0f7 100644
--- a/test/cctest/test-cpu-profiler.cc
+++ b/test/cctest/test-cpu-profiler.cc
@@ -1040,7 +1040,7 @@ static void TickLines(bool 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"