Uses SNPRINT macro where possible. Otherwise uses #define for format.

runtime/vm/benchmark_test.cc

Index: runtime/vm/benchmark_test.cc
diff --git a/runtime/vm/benchmark_test.cc b/runtime/vm/benchmark_test.cc
index ee3ca574a87d49d1e6df0f6d7637b96a64d0a7e6..0f732f9f65f9a9ee58d6b760667ee3e937685a21 100644
--- a/runtime/vm/benchmark_test.cc
+++ b/runtime/vm/benchmark_test.cc
@@ -354,12 +354,8 @@ BENCHMARK(Dart2JSCompileAll) {
   char* script = NULL;
   if (dart_root != NULL) {
     HANDLESCOPE(thread);
-    const char* kFormatStr =
-        "import '%s/pkg/compiler/lib/compiler.dart';";
-    intptr_t len = OS::SNPrint(NULL, 0, kFormatStr, dart_root) + 1;
-    script = reinterpret_cast<char*>(malloc(len));
-    EXPECT(script != NULL);
-    OS::SNPrint(script, len, kFormatStr, dart_root);
+    script = OS::SNCreate(NULL,
+        "import '%s/pkg/compiler/lib/compiler.dart';", dart_root);
     Dart_Handle lib = TestCase::LoadTestScript(
         script,
         reinterpret_cast<Dart_NativeEntryResolver>(NativeResolver));