RFR(S) 8240244 Avoid calling resolve_super_or_fail in SystemDictionary::load_shared_class

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8240244
http://cr.openjdk.java.net/~iklam/jdk15/8240244-reduce-resolve-super.v01/

When loading shared classes from the CDS archive, we need to test if the
actually loaded super types are the same as those used during CDS dumping.
That was done with a pretty expensive call to resolve_super_or_fail.

In most cases, the super type has already been loaded (about 350 out of 400
cases when running HelloWorld), so we can quickly determine that by
doing a look up in the super type's dictionary.

This saves about 250,000 out of about 112M instructions (about 0.22%) when
running HelloWorld with the default archive on Linux/x64.

I also renamed a few functions in instanceKlass.hpp to _xxx_shared_xxx since
they are used only for CDS.

Thanks
- Ioi