[8u40] Request for approval for bulk integration of hs25.40-b12

[Alejandro E Murillo]

Requesting approval to integrate hs25.40-b12 into jdk8u40-b08.

A webrev is available at:

http://cr.openjdk.java.net/~amurillo/8u40/hs25.40-b12-jdk8u40-b08.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.

8048268: G1 Code Root Migration performs poorly
8050022: linux-sparcv9: assert(SharedSkipVerify || obj->is_oop()) failed: sanity check
8052313: Backport CDS tests from JDK-9 to jdk8_u40
8056084: Refactor Hashtable to allow implementations without rehashing support
8057722: G1: Code root hashtable updated incorrectly when evacuation failed
8058564: Tiered compilation performance drop in PIT
8058744: Crash in C1 OSRed method w/ Unsafe usage
8058798: new hotspot build - hs25.40-b12
8058936: hotspot/test/Makefile should use jtreg script from $JT_HOME/bin/jreg (instead of $JT_HOME/win32/bin/jtreg)
8059002: 8058744 needs a test case

-- 
Alejandro