[lworld+vector] RFR: Merge lworld

[Jatin Bhateja]

Merge latest lworld changes into lworld+vector branch.

All VectorAPI and Valhalla tests are passing at various AVX levels with and w/o -XX:+DeoptimizeALot.

Best Regards,
Jatin

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Commit messages:
 - jcheck failure fix
 - Removing a white space
 - Merge branch 'lworld' of http://github.com/openjdk/valhalla into merge_lworld_branch
 - Merge jdk
 - 8316661: CompilerThread leaks CodeBlob memory when dynamically stopping compiler thread in non-product
 - 8315721: CloseRace.java#id0 fails transiently on libgraal
 - 8315966: Relativize initial_sp in interpreter frames
 - 8316924: java/lang/Thread/virtual/stress/ParkALot.java times out
 - 8316710: Exclude java/awt/font/Rotate/RotatedTextTest.java
 - 8299915: Remove ArrayAllocatorMallocLimit and associated code
 - ... and 780 more: https://git.openjdk.org/valhalla/compare/6d74481c...d6e58623

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld+vector: https://webrevs.openjdk.org/?repo=valhalla&pr=970&range=00.0
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=970&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/970/files
  Stats: 168937 lines in 4566 files changed: 79424 ins; 38494 del; 51019 mod
  Patch: https://git.openjdk.org/valhalla/pull/970.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/970/head:pull/970

PR: https://git.openjdk.org/valhalla/pull/970