check functions for AccessSpreader

Summary: Add some functions for looking at the code generated by `AccessSpreader<>::current()` and `AccessSpreader<>::cachedCurrent()`.

Differential Revision: D27747508

fbshipit-source-id: 0bc44938e810ec76ead50b6d4c1ade4aec9f8282

folly/concurrency/test/CacheLocalityBenchmark.cpp

@@ -23,9 +23,20 @@
 #include <glog/logging.h>
 
 #include <folly/Benchmark.h>
+#include <folly/lang/Keep.h>
 
 using namespace folly;
 
+extern "C" FOLLY_KEEP size_t
+check_access_spreader_atomic_current(size_t numStripes) {
+  return AccessSpreader<>::current(numStripes);
+}
+
+extern "C" FOLLY_KEEP size_t
+check_access_spreader_atomic_cached_current(size_t numStripes) {
+  return AccessSpreader<>::cachedCurrent(numStripes);
+}
+
 #define DECLARE_SPREADER_TAG(tag, locality, func)      \
   namespace {                                          \
   template <typename dummy>                            \