Summary: Add JDK code of the Wisp implementation

Test Plan: all Wisp tests

Reviewed-by: yuleil, shiyuexw, sanhong

Issue: https://github.com/alibaba/dragonwell8/issues/113

Summary: ported MultiTenant framework to Dragonwell8

Test Plan: jdk/test/multi-tenant

Reviewed-by: yuleil, sanhong

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

Summary: G1ElasticHeap to support heap shrink/expansion in runtime

Test Plan:
test/elastic-heap/

Reviewers:
luchsh, sanhong

Issue:
https://github.com/alibaba/dragonwell8/issues/46

CR:
https://github.com/alibaba/dragonwell8_jdk/pull/1

Summary:
port jwarmup to dragonwell 8u
ref T19299187

Test Plan: see hotspot part

Reviewers: 三红, yumin.qi

Reviewed By: 三红, yumin.qi

Subscribers: 麦庶

Differential Revision: https://aone.alibaba-inc.com/code/D852150

Summary: Wrap further native methods in FileInputStreams
Reviewed-by: chegar, bpb, rriggs
Contributed-by: sunny.chan@gs.com

Summary: Wrap some native methods in Java methods.
Reviewed-by: rriggs

Reviewed-by: erikj, tbell

Reviewed-by: alanb, dholmes, mr, plevart, psandoz

Reviewed-by: alanb, forax, dholmes, twisti

Reviewed-by: jrose, alanb, twisti

Reviewed-by: ihse, erikj, ohrstrom, tbell

Reviewed-by: ohair, ohrstrom, ihse, jonas
Contributed-by: Njonas &lt;jonas.oreland@oracle.com&gt;, erikj &lt;erik.joelsson@oracle.com&gt;, ihse &lt;magnus.ihse.bursie@oracle.com&gt;, tgranat &lt;torbjorn.granat@oracle.com&gt;, ykantser <yekaterina.kantserova@oracle.com>

Summary: New makefiles transition, old and new living side by side for now.
Reviewed-by: ohair, jjg, dholmes, ohrstrom, erikj, ihse, tgranat, ykantser
Contributed-by: Nohrstrom &lt;fredrik.ohrstrom@oracle.com&gt;, erikj &lt;erik.joelsson@oracle.com&gt;, ihse &lt;magnus.ihse.bursie@oracle.com&gt;, tgranat &lt;torbjorn.granat@oracle.com&gt;, ykantser <yekaterina.kantserova@oracle.com>

Reviewed-by: alanb