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: Compile fdlibm with -O3 and relevant C flags on gcc arches.
Reviewed-by: mbaesken, andrew

Reviewed-by: erikj, dholmes

Reviewed-by: erikj, ihse, ddehaven, billyh

Reviewed-by: alanb, sherman, ahgross, jeff

Reviewed-by: alanb, sherman, ahgross, jeff

Summary: Backed out changeset 018769d53c80
Reviewed-by: coffeys

Reviewed-by: erikj

Reviewed-by: erikj

Reviewed-by: sherman, jeff

Reviewed-by: sherman, jeff

Reviewed-by: coffeys, igerasim

Reviewed-by: mdoerr, erikj, simonis, aph

8066504: GetVersionEx in java.base/windows/native/libjava/java_props_md.c might not get correct Windows version 0
Summary: System property os.name and os.version should report the version of kernel32.dll
Reviewed-by: alanb, igerasim

Reviewed-by: naoto

Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene

Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene

Summary: to upgrade zlib version from 1.2.5 to 1.2.8
Reviewed-by: alanb

Reviewed-by: dholmes, erikj

Reviewed-by: erikj, tbell

Summary: fixes the build on AIX again after the latest sync from jdk8
Reviewed-by: kvn

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

Reviewed-by: alanb

Reviewed-by: martin, dholmes
Contributed-by: NTristan Yan <tristan.yan@oracle.com>

Reviewed-by: erikj