Summary:
- Javac code may be used to generate Java class dynamically, so have
  to be taken care of
- Fixed cross-tenant classloader hierarchy
- Isolated ZipFileIndexCache.sharedInstance

Test Plan: langtools/test/multi-tenant

Reviewed-by: yuleil, superajun-wsj

Issue: https://github.com/alibaba/dragonwell8/issues/84

Reviewed-by: ksrini
Contributed-by: steve.sides@oracle.com

Reviewed-by: jfranck

Summary: Adjusting javax.lang.model javadoc regarding IntersectionType, IntersectionType.accept now calls visitIntersection for all kinds of IntersectionTypes.
Reviewed-by: darcy, vromero
Contributed-by: joe.darcy@oracle.com, jan.lahoda@oracle.com

Reviewed-by: jjg, jlahoda, sogoel

Reviewed-by: jjg

Reviewed-by: jjg
Contributed-by: wdietl@gmail.com, steve.sides@oracle.com

Reviewed-by: darcy

Reviewed-by: jjg

Reviewed-by: darcy

Reviewed-by: jjg

Reviewed-by: abuckley, jjg, jfranck

Reviewed-by: jjg

Reviewed-by: jjg

Reviewed-by: abuckley, jjg

Reviewed-by: jjg

Reviewed-by: vromero, darcy

Reviewed-by: abuckley, jjg

Reviewed-by: jjg

Reviewed-by: jjg, abuckley

Reviewed-by: darcy

Reviewed-by: darcy

Reviewed-by: darcy

Reviewed-by: darcy, abuckley

Reviewed-by: jjg

Reviewed-by: jjg

Reviewed-by: jjg
Contributed-by: mernst@cs.washington.edu, wmdietl@cs.washington.edu, mpapi@csail.mit.edu, mahmood@notnoop.com

Reviewed-by: lancea, alanb, jfranck

Reviewed-by: jjg

Reviewed-by: abuckley

Reviewed-by: ohair

Reviewed-by: jjg

Reviewed-by: jjg

Summary: Add parser and type-checking support for intersection types in cast expressions
Reviewed-by: jjg

Reviewed-by: jjg, mcimadamore

Reviewed-by: darcy

Reviewed-by: darcy

Reviewed-by: mcimadamore

Reviewed-by: mcimadamore, darcy, ohrstrom

Reviewed-by: mcimadamore, jjg