[8u20] Request for approval for bulk integration of hs25.20-b02

[Alejandro E Murillo]

Requesting approval to integrate hs25.20-b02 into jdk8u20-b01.

A webrev is available at:

http://cr.openjdk.java.net/~amurillo/8u20/hs25.20-b02-jdk8u20-b01.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.

8027364: PSScavenge accounts too large code section to StringTable unlink
8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark
8027455: Improve symbol table scan times during gc pauses
8027476: Improve performance of Stringtable unlink
8027746: Remove do_gen_barrier template parameter in G1ParCopyClosure
8028553: The JVM should not throw VerifyError when 'overriding' a static final method in a superclass.
8030027: nsk/jvmti/scenarios/hotswap/HS101/hs101t006 Crashed the vm on Linux-amd64: SIGSEGV in JavaThread::last_java_vframe(RegisterMap*)+0xfa
8030955: assert(_prologue != NULL) failed: prologue pointer must be initialized
8031045: Access checks should precede additional per-instruction checks
8032014: new hotspot build - hs25.20-b02

-- 
Alejandro