Summary: Fix build issues on Windows/Mac from G1ElasticHeap

Test Plan:
test/elastic_heap/

Reviewers:
shiyuexw, sanhong

Issue:
https://github.com/alibaba/dragonwell8/issues/54

CR:

Summary: G1ElasticHeap to support heap shrink/expansion in runtime

Test Plan:
test/elastic-heap/

Reviewers:

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

CR:
https://github.com/alibaba/dragonwell8_hotspot/pull/12

Summary:
  Port jwarmup to dragonwell 8u hotspot

ref T19299187

Test Plan:
test/hotspot/jtreg/jwarmup/Issue11272598.java
test/hotspot/jtreg/jwarmup/TestDisableNCE.java
test/hotspot/jtreg/jwarmup/TestNotDeoptJITMethod.sh
test/hotspot/jtreg/jwarmup/issue9780156.sh
test/hotspot/jtreg/jwarmup/TestEagerCompilation.java
test/hotspot/jtreg/jwarmup/TestNotifyDeopt.sh
test/hotspot/jtreg/jwarmup/TestCheckIfCompilationIsComplete.sh
test/hotspot/jtreg/jwarmup/TestFlagAssertion.java
test/hotspot/jtreg/jwarmup/TestReadLogfile.java
test/hotspot/jtreg/jwarmup/TestClassInitChain.java
test/hotspot/jtreg/jwarmup/TestLogFlush.java
test/hotspot/jtreg/jwarmup/TestRecordNullMethodCounter.java
test/hotspot/jtreg/jwarmup/TestThrowInitializaitonException.java
test/hotspot/jtreg/jwarmup/TestDisableMethodData.sh
test/hotspot/jtreg/jwarmup/TestMethodRecorder.java
test/hotspot/jtreg/jwarmup/TestTieredCompilationInRecording.sh

Reviewers: 传胜, 三红, yumin.qi

Reviewed By: 传胜, 三红

Subscribers: 麦庶

Differential Revision: https://aone.alibaba-inc.com/code/D852146

Reviewers: 效山, 芳玺, 传胜, 三红, yumin.qi

Reviewed By: 三红, 芳玺, 效山, 卓仁

Differential Revision: https://aone.alibaba-inc.com/code/D815657

Summary: Prepare Zero build for backport of JDK-8062808.
Reviewed-by: sgehwolf

Reviewed-by: clanger, andrew

Summary: Compile with -O3 and relevant C flags as for fdlibm.
Reviewed-by: andrew

Reviewed-by: erikj, dholmes

Summary: Remove Linux kernel version check as very unlikely a kernel older than 2.4 will be used.
Reviewed-by: erikj

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

Reviewed-by: erikj

Reviewed-by: tbell

Summary: Only produce those files if STRIP_POLICY != no_strip
Reviewed-by: erikj

Summary: Only add .gnu_debuglink sections when there is some stripping done.
Reviewed-by: erikj, dholmes

Reviewed-by: dholmes, erikj

Reviewed-by: dholmes, erikj

Reviewed-by: erikj

Summary: Generate debug info for assembler files as needed.
Reviewed-by: erikj

Reviewed-by: tbell

Reviewed-by: dcubed, mikael

Reviewed-by: dcubed, mikael

Summary: move arm and gcc logic from open gcc.make to closed
Reviewed-by: dholmes, kvn

Summary: move nm and awk code into vm.make
Reviewed-by: dsamersoff, dholmes

Summary: refactor close to remove references to closed ports
Reviewed-by: kvn, simonis, sgehwolf, dholmes

Summary: Add "4" to list of allowable versions
Reviewed-by: dholmes, mikael

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

Summary: Store the value set by the user and some makefile changes required to change the flags.
Reviewed-by: sla, mchung, bchristi, jmasa, dholmes

Summary: Add EXTRA_LDFLAGS to linker flags for relevant libraries.
Reviewed-by: ihse

Reviewed-by: erikj, dholmes

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

Summary: libjvm.so which is generated by GCC 5 does not have .note.stapsdt section as dtrace was disabled due to incorrect version check
Reviewed-by: dholmes, coleenp

Reviewed-by: mgronlun, kamg

Reviewed-by: twisti, kvn

Reviewed-by: erikj, jcbeyler

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

Reviewed-by: kvn, coleenp
Contributed-by: axel.siebenborn@sap.com, martin.doerr@sap.com

Reviewed-by: erikj

Reviewed-by: dholmes, erikj

Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov

Reviewed-by: goetz, kvn, dholmes, simonis
Contributed-by: asmundak@google.com