Merge pull request #9581 from kjbracey-arm/sharedptr_atomic

SharedPtr: use atomic load

Author: 0xc0170

platform/SharedPtr.h

@@ -177,10 +177,7 @@ class SharedPtr {
     uint32_t use_count() const
     {
         if (_ptr != NULL) {
-            core_util_critical_section_enter();
-            uint32_t current_counter = *_counter;
-            core_util_critical_section_exit();
-            return current_counter;
+            return core_util_atomic_load_u32(_counter);
         } else {
             return 0;
         }
@@ -230,8 +227,7 @@ class SharedPtr {
     void decrement_counter()
     {
         if (_ptr != NULL) {
-            uint32_t new_value = core_util_atomic_decr_u32(_counter, 1);
-            if (new_value == 0) {
+            if (core_util_atomic_decr_u32(_counter, 1) == 0) {
                 delete _counter;
                 _counter = NULL;
                 delete _ptr;