RFR: Merge lworld

[Vicente Romero]

Merge lworld into lw5

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - Merge jdk
 - 8329254: optimize integral reverse operations on x86 GFNI target.
 - 8329656: assertion failed in MAP_ARCHIVE_MMAP_FAILURE path: Invalid immediate -5 0
 - 8329491: GetThreadListStackTraces function should use JvmtiHandshake
 - 8329432: PopFrame and ForceEarlyReturn functions should use JvmtiHandshake
 - 8330033: com/sun/net/httpserver/bugs/B6431193.java fails in AssertionError after JDK-8326568
 - 8329961: Buffer overflow in os::Linux::kernel_version
 - 8327137: Add test for ConcurrentModificationException in BasicDirectoryModel
 - 8309751: Duplicate constant pool entries added during default method processing
 - ... and 174 more: https://git.openjdk.org/valhalla/compare/9daec2e6...c0af961a

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lw5: https://webrevs.openjdk.org/?repo=valhalla&pr=1240&range=00.0
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1240&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1240/files
  Stats: 32338 lines in 788 files changed: 14503 ins; 12605 del; 5230 mod
  Patch: https://git.openjdk.org/valhalla/pull/1240.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1240/head:pull/1240

PR: https://git.openjdk.org/valhalla/pull/1240