ASAN fix for test_malloc_regression (#415)

ASAN allocator never releases memory to OS, instead of it just marks those memory as "freed".
Generic OS functions for getting currently allocated memory aren't working correctly under ASAN.

- Using __sanitizer_get_current_allocated_bytes func instead of generic OS func for getting currently allocated memory

Signed-off-by: Serov, Vladimir <vladimir.serov@intel.com>