[8u20] Request for approval for bulk integration of hs25.20-b19

[Alejandro E Murillo]

Requesting approval to integrate hs25.20-b19 into jdk8u20-b19.

A webrev is available at:

http://cr.openjdk.java.net/~amurillo/8u20/hs25.20-b19-jdk8u20-b19.webrev/

Pre-integration testing is in progress; the integration will proceed
only after SQE has analyzed the results and approved.

The fixes in the proposed integration are below.  All have undergone
nightly testing and are already in a jdk9 repository.

8029381: assert(is_method_type()) failed: bad cast
8032410: compiler/uncommontrap/TestStackBangRbp.java times out on Solaris-Sparc V9
8034188: OSR methods may not be recompiled at proper compilation level
8040244: compiler/whitebox/IsMethodCompilableTest.java fails
8042933: assert(capacity_until_gc >= committed_bytes) failed
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
8043915: Tests get ClassNotFoundException: com.oracle.java.testlibrary.StreamPumper
8046232: new hotspot build - hs25.20-b19
8046275: Fastdebug build failing on jdk9/hs/ control jobs after pulling some hs-comp changes
8046287: [TESTBUG] runtime/Thread/TestThreadDumpMonitorContention.java failed error_cnt=12
8046516: Segmentation fault in JVM (easily reproducible)

-- 
Alejandro