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

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

Summary: Add classLoader to java/lang/Class instance for fast access
Reviewed-by: alanb, lfoltan, rriggs, vlivanov, twisti, mchung, jfranck, dholmes

Summary: Improve protection domain check in forName()
Reviewed-by: mchung, acorn, jdn

Reviewed-by: kamg, mgronlun

Reviewed-by: alexsch, smarks

Reviewed-by: alanb, forax, dholmes, twisti

Summary: Remove typeAnnotations field from Method, Constructor, and Field, update  Executable and Field to fetch data on demand.
Reviewed-by: darcy, erikj

Summary: setProtectionDomain0 and JVM_SetProtectionDomain are unused since at least 1.5.  This is the JDK side of a changeset to remove it.
Reviewed-by: alanb

Reviewed-by: jrose, alanb, twisti

Summary: Recognize VM generated method in old verifier. With 8004967
Reviewed-by: coleenp, acorn
Contributed-by: bharadwaj.yadavalli@oracle.com

Summary: Remove is_kernel_jvm field in jvm_version_info structure, as kernel VM has been deprecated
Reviewed-by: mchung

Reviewed-by: darcy

Reviewed-by: alanb, darcy
Contributed-by: eric.mccorkle@oracle.com

Reviewed-by: darcy, forax, psandoz, dholmes, tbell

Reviewed-by: chegar, ksrini

Reviewed-by: chegar
Contributed-by: NKrystal Mok <sajia@taobao.com>

Reviewed-by: jjh, alanb, dholmes, anthony, ohrstrom, ksrini, jrose, weijun, smarks
Contributed-by: NAlan Bateman &lt;alan.bateman@oracle.com&gt;, Alexander Potochkin &lt;alexander.potochkin@oracle.com&gt;, Alexander Zuev &lt;alexander.zuev@oracle.com&gt;, Andrew Brygin &lt;andrew.brygin@oracle.com&gt;, Artem Ananiev &lt;artem.ananiev@oracle.com&gt;, Alex Strange &lt;astrange@apple.com&gt;, Bino George &lt;bino@apple.com&gt;, Christine Lu &lt;christine.lu@oracle.com&gt;, David Katleman &lt;david.katleman@oracle.com&gt;, David Durrence &lt;david_durrence@apple.com&gt;, Dmitry Cherepanov &lt;dmitry.cherepanov@oracle.com&gt;, Greg Lewis &lt;glewis@eyesbeyond.com&gt;, Kevin Miller &lt;kevin_m_miller@apple.com&gt;, Kurt Miller &lt;kurt@intricatesoftware.com&gt;, Landon Fuller &lt;landonf@plausiblelabs.com&gt;, Leonid Romanov &lt;leonid.romanov@oracle.com&gt;, Loefty Walkowiak &lt;loefty@apple.com&gt;, Mark Reinhold &lt;mark.reinhold@oracle.com&gt;, Naoto Sato &lt;naoto.sato@oracle.com&gt;, Philip Race &lt;philip.race@oracle.com&gt;, Roger Hoover &lt;rhoover@apple.com&gt;, Scott Kovatch &lt;scott.kovatch@oracle.com&gt;, Sergey ByloKhov &lt;sergey.bylokhov@oracle.com&gt;, Mike Swingler &lt;swingler@apple.com&gt;, Tomas Hurka <tomas.hurka@oracle.com>

4268317: (ref) Reference.isEnqueued() can return true when instance not enqueued
Summary: The reference handler now declares, and assumes, that the discovered field, rather than the next field, is (to be) used to link the entries in the pending list, thus allowing a reference object to be safely enqueued even while it is in the pending state. Also added slightly modified regression tests from the two bug reports.
Reviewed-by: mchung, alanb, jcoomes

Reviewed-by: mchung, ksrini, ohair

Reviewed-by: darcy, weijun

Summary: Change findBootstrapClass to return null instead of throwing CNFE if class not found
Reviewed-by: alanb, dholmes, iris

Reviewed-by: alanb

Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

Summary: Initial checkin of JSDT code
Reviewed-by: sspitsyn, sbohne