[8u20] Request for approval for bulk integration of hs25.20-b03

[Alejandro E Murillo]

Requesting approval to integrate hs25.20-b03 into jdk8u20-b01.

A webrev is available at:

http://cr.openjdk.java.net/~amurillo/8u20/hs25.20-b03-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 jdk8 repository.

6991197: G1: specialize deal_with_reference() for narrowOop*
8021774: [TESTBUG] Tests failed because of a warning in its output
8028391: Make the Min/MaxHeapFreeRatio flags manageable
8032771: The flag VerifySilently misses a test case
8032985: new hotspot build - hs25.20-b03
8033106: Wrong predicate for checking whether the correct amount of symbol table entries have been processed in G1
8033443: Test8000311 fails after latest changes to parallelize string and symbol table unlink

-- 
Alejandro