RFR(S) 8210864 Reduce the use of metaspaceShared.hpp

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8210864
http://cr.openjdk.java.net/~iklam/jdk12/8210864-reduce-metaspaceShared-hpp-include.v01/

I really hate it whenever I edit metaspaceShared.hpp I have to
rebuild almost every source file in HotSpot. That's due to this
usage in the popular header file oop.inline.hpp:

     void oopDesc::forward_to(oop p) {
       ...
       assert(!MetaspaceShared::is_archive_object(oop(this)) &&
              !MetaspaceShared::is_archive_object(p),
              "forwarding archive object");


The fix is to change the call to oopDesc::is_archive_object() which is
defined out-of-line.

With this change, the number of dependent .o files reduced from 500+ to
45.

I added metaspaceShared.inline.hpp so oopDesc::forward_to should be
as fast as before, and all other callers of 
MetaspaceShared::is_archive_object
should be a little faster (probably not measurable).

I also removed a few unnecessary includes of metaspaceShared.hpp

Thanks
- Ioi