revise SingletonRelaxedCounter check functions

Summary: Rename, mark as kept, add a version taking an argument

Differential Revision: D27383132

fbshipit-source-id: 214af5b09e42159756e97b3b829ac9ecb237c17b

folly/experimental/test/SingletonRelaxedCounterBench.cpp

@@ -23,23 +23,27 @@
 
 #include <folly/Benchmark.h>
 #include <folly/init/Init.h>
+#include <folly/lang/Keep.h>
 #include <folly/portability/GFlags.h>
 
 DEFINE_int32(num_threads, 4, "No. of threads allocting the objects");
 
-namespace folly {
-
 namespace {
 struct PrivateTag {};
 } // namespace
 
-using Counter = SingletonRelaxedCounter<size_t, PrivateTag>;
+using Counter = folly::SingletonRelaxedCounter<size_t, PrivateTag>;
 
 // small wrappers around the functions being benchmarked
 // useful for looking at the inlined native code of the fast path
-extern "C" void check() noexcept {
+extern "C" FOLLY_KEEP void check_singleton_relaxed_counter_add_1() {
   Counter::add(1);
 }
+extern "C" FOLLY_KEEP void check_singleton_relaxed_counter_add(size_t i) {
+  Counter::add(i);
+}
+
+namespace folly {
 
 // a noop which the compiler cannot see through
 // used to prevent some compiler optimizations which could skew benchmarks