Initial runtime support for the ValueTypes attribute

[Karen Kinnear]

Frederic,

Code looks really good. Many thanks for doing this so quickly and carefully.
Thank you for the symbol refcount handling.

Summary:
  declared fields (static and instance): preload, i.e. classfileparser loads before completing container loading
  linkage to fields and methods, we load at link time prior to creation of vtables/itables

- this all sounds correct to me.

instanceKlass.cpp: 621
  - comment is that arrays of value types are not handled
  - do we actually need to preload arrays of value types at link time for any optimizations?

Empty.java: line 40: Excepted -> Expected

thanks,
Karen

> On May 17, 2018, at 4:04 PM, Frederic Parain <frederic.parain at oracle.com> wrote:
> 
> Please review this first patch related to the ValueTypes attribute:
> 
> http://cr.openjdk.java.net/~fparain/VTAttribute/webrev.00/
> 
> The patch includes:
>  - the parsing of the ValueTypes attribute
>  - the creation of meta-data from this attribute
>  - a consistency check between the ACC_FLATTENABLE flag
>    and the ValueTypes attribute
>  - the pre-loading of method arguments types and return values types
> 
> Fred
>