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: Introduce alignment-safe Copy::conjoint_swap and JVM_CopySwapMemory
Reviewed-by: mikael, dholmes

Summary: Introduce alignment-safe Copy::conjoint_swap and JVM_CopySwapMemory
Reviewed-by: mikael, dholmes

Reviewed-by: chegar, acorn

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

Reviewed-by: chegar, rriggs, coffeys

Reviewed-by: chegar, rriggs, coffeys

Reviewed-by: coffeys, igerasim

Reviewed-by: mchung, alanb

Summary: Implemented the interface in sun.misc.URLClassPath and corresponding JVM_XXX APIs
Reviewed-by: mchung, acorn, jiangli, dholmes

8033370: [parfait] warning from b126 for solaris/native/sun/util/locale/provider: JNI exception pending
Reviewed-by: msheppar

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

Reviewed-by: kamg, mgronlun

Reviewed-by: alanb, dsamersoff, jbachorik

Reviewed-by: erikj, tbell