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

Reviewed-by: vinnie

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: prr, ssadetsky

Reviewed-by: coffeys

Summary: The AWT Robot X11 code that takes screenshots uses the default root window, which may not contain the final composited desktop.
Reviewed-by: alexsch, ssadetsky, prr, dbuck

Reviewed-by: prr, serb

8171452: (ch) linux io_util_md: Operation not supported exception after 8168628
Reviewed-by: alanb, bpb

8171452: (ch) linux io_util_md: Operation not supported exception after 8168628
Reviewed-by: alanb, bpb

Reviewed-by: chegar, acorn

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

Reviewed-by: prr, jdv

Reviewed-by: prr, jdv

Reviewed-by: chegar, rriggs, coffeys

Reviewed-by: chegar, rriggs, coffeys

Reviewed-by: coffeys, igerasim

Reviewed-by: chegar

Reviewed-by: xuelei, valeriep, coffeys
Contributed-by: valerie.peng@oracle.com

Reviewed-by: xuelei, valeriep, coffeys
Contributed-by: valerie.peng@oracle.com

Reviewed-by: michaelm

Reviewed-by: michaelm

Reviewed-by: mchung, alanb

Reviewed-by: pchelko, anthony, ksrini

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

Reviewed-by: robm

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

Reviewed-by: egahlin, sla

Reviewed-by: alanb
Contributed-by: kirk.shoop@microsoft.com, v-valkop@microsoft.com

Reviewed-by: prr

Reviewed-by: chegar, alanb

Reviewed-by: serb, ihse

Reviewed-by: serb, pchelko
Contributed-by: NDavid DeHaven <david.dehaven@oracle.com>

Reviewed-by: kamg, mgronlun

Summary: Make sure private key structure is freed for EC key pair generation
Reviewed-by: vinnie

Reviewed-by: erikj

Reviewed-by: alanb, dsamersoff, jbachorik

Reviewed-by: alanb, michaelm