C++20 adds std::bit_cast.  It completely covers the cases currently supported by our PrimitiveConversions::cast.  Replace when we have C++20 support.
            
- relates to
 - 
                    
JDK-8299688 Adopt C++14 compatible std::bit_cast introduced in C++20
-         
     - Closed
 
 -         
 - 
                    
JDK-8247909 Improve PrimitiveConversions::cast using C++14
-         
     - Resolved
 
 -