RFR: Merge lworld

[Vicente Romero]

Merging lworld into universal-tvars

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Commit messages:
 - Merge lworld
 - 8272041: [lworld] CDS heap dump fails with primitive objects
 - 8271924: [lworld] Crashes in ZBarrierSetRuntime::load_barrier_on_oop_array
 - Merge jdk
 - 8265057: G1: Investigate removal of maintenance of two BOT thresholds
 - 8256844: Make NMT late-initializable
 - 6350025: API documentation for JOptionPane using deprecated methods.
 - 8270893: IndexOutOfBoundsException while reading large TIFF file
 - 8271836: runtime/ErrorHandling/ClassPathEnvVar.java fails with release VMs
 - 8264543: Cross modify fence optimization for x86
 - ... and 75 more: https://git.openjdk.java.net/valhalla/compare/3e896faf...d775b1c3

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - universal-tvars: https://webrevs.openjdk.java.net/?repo=valhalla&pr=530&range=00.0
 - lworld: https://webrevs.openjdk.java.net/?repo=valhalla&pr=530&range=00.1

Changes: https://git.openjdk.java.net/valhalla/pull/530/files
  Stats: 36316 lines in 284 files changed: 33505 ins; 1621 del; 1190 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/530.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/530/head:pull/530

PR: https://git.openjdk.java.net/valhalla/pull/530