remove lock code from atomics (as it is unused)

test/main.c

@@ -11,6 +11,17 @@ void test_heap(void* p_out) {
   //mi_heap_delete(heap); mi_free(p1); mi_free(p2);
 }
 
+void test_large() {
+  const size_t N = 1000;
+
+  for (size_t i = 0; i < N; ++i) {
+    size_t sz = 1ull << 21;
+    char* a = mi_mallocn_tp(char,sz);
+    for (size_t k = 0; k < sz; k++) { a[k] = 'x'; }
+    mi_free(a);
+  }
+}
+
 int main() {
   void* p1 = mi_malloc(16);
   void* p2 = mi_malloc(1000000);
@@ -27,9 +38,9 @@ int main() {
   p2 = mi_malloc_aligned(160,24);
   mi_free(p2);
   mi_free(p1);
-  
+  //test_large();
+
   mi_collect(true);
   mi_stats_print(NULL);
   return 0;
 }
-