[8u20] Request for approval for bulk integration of hs25.20-b07

[Alejandro E Murillo]

Requesting approval to integrate hs25.20-b07 into jdk8u20-b07.

A webrev is available at:

http://cr.openjdk.java.net/~amurillo/8u20/hs25.20-b07-jdk8u20-b07.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.

8027754: Enable loop optimizations for loops with MathExact inside
8030177: G1: Enable TLAB resizing
8031321: Support Intel bit manipulation instructions
8031752: Failed speculative optimizations should be reattempted when root of compilation is different
8031754: Type speculation should favor profile data from outermost inlined method
8032633: Enable type speculation by default
8034079: G1: Refactor the HeapRegionSet hierarchy
8035841: assert(dp_src->tag() == dp_dst->tag()) failed: should be same tags 1 != 0 at ciMethodData.cpp:90
8036092: [TESTBUG] compiler/uncommontrap/TestSpecTrapClassUnloading.java fails with: Unrecognized VM option 'UseTypeSpeculation'
8037226: compiler/7196199/Test7196199.java fails on 32-bit linux with MaxVectorSize > 16
8037305: new hotspot build - hs25.20-b07
8037340: Linux semaphores to use CLOCK_REALTIME
8037407: G1: Remove heapRegionSets.cpp

-- 
Alejandro