Re-enable support for implicit producer hash slot reuse following fixes

Author: cameron314

concurrentqueue.h

@@ -218,7 +218,7 @@ namespace moodycamel { namespace details {
 // Finally, iOS/ARM doesn't have support for it either, and g++/ARM allows it to compile but it's unconfirmed to actually work
 #if (!defined(_MSC_VER) || _MSC_VER >= 1900) && (!defined(__MINGW32__) && !defined(__MINGW64__) || !defined(__WINPTHREADS_VERSION)) && (!defined(__GNUC__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && (!defined(__APPLE__) || !TARGET_OS_IPHONE) && !defined(__arm__) && !defined(_M_ARM) && !defined(__aarch64__)
 // Assume `thread_local` is fully supported in all other C++11 compilers/platforms
-//#define MOODYCAMEL_CPP11_THREAD_LOCAL_SUPPORTED    // tentatively enabled for now; years ago several users report having problems with it on
+#define MOODYCAMEL_CPP11_THREAD_LOCAL_SUPPORTED    // tentatively enabled for now; years ago several users report having problems with it on
 #endif
 #endif
 #endif