RFR: 8283726: x86 intrinsics for compare method in Integer and Long [v2]

[Vamsi Parasa]

> Implements x86 intrinsics for compare() method in java.lang.Integer and java.lang.Long.

Vamsi Parasa has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - refactored x86_64.ad code to macro assembly routines
 - Merge branch 'master' of https://git.openjdk.java.net/jdk into cmp
 - add JMH benchmarks
 - 8283726: x86 intrinsics for compare method in Integer and Long

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7975/files
  - new: https://git.openjdk.java.net/jdk/pull/7975/files/b0c3314d..79e4aa50

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7975&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7975&range=00-01

  Stats: 5452 lines in 218 files changed: 3925 ins; 856 del; 671 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7975.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7975/head:pull/7975

PR: https://git.openjdk.java.net/jdk/pull/7975