[lworld] RFR: Merge jdk

[David Simms]

Merge tag 'jdk-16+16'

Any branch or tag names allowed

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

Commit messages:
 - Any branch or tag names allowed
 - Merge tag 'jdk-16+16' into lworld_merge_jdk_16_16
 - 8253130: bug7072653.java failed "Popup window height ... is wrong"
 - 8253125: vmTestbase/nsk/stress/stack/stack017.java timed out
 - 8253244: Shenandoah: cleanup includes in Shenandoah root processor files
 - 8253207: enable problemlists jcheck's check
 - 6714834: JarFile.getManifest() leaves an open InputStream as an undocumented side effect
 - 8244706: GZIP "OS" header flag hard-coded to 0 instead of 255 (RFC 1952 non-compliance)
 - 8253206: Enforce whitespace checking for additional source files
 - 8253162: Make frame::oops_do const
 - ... and 65 more: https://git.openjdk.java.net/valhalla/compare/174dcf50...d6adc91d

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.java.net/?repo=valhalla&pr=192&range=00.0
 - jdk: https://webrevs.openjdk.java.net/?repo=valhalla&pr=192&range=00.1

Changes: https://git.openjdk.java.net/valhalla/pull/192/files
  Stats: 15807 lines in 440 files changed: 8027 ins; 5432 del; 2348 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/192.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/192/head:pull/192

PR: https://git.openjdk.java.net/valhalla/pull/192