[lworld] RFR: Merge jdk [v2]

[David Simms]

> Merge tag 'jdk-16+20'
> 
> # Conflicts:
> #	src/hotspot/cpu/x86/frame_x86.cpp
> #	src/hotspot/share/classfile/classFileParser.cpp
> #	src/hotspot/share/opto/cfgnode.hpp
> #	src/hotspot/share/runtime/thread.cpp

David Simms has updated the pull request incrementally with 25 additional commits since the last revision:

 - Merge commit '5145bed0282575a580cf3ebc343038c1dc8ddb8d' into lworld_merge_jdk_16_20
 - 8254125: Assertion in cppVtables.cpp during builds on 32bit Windows
   
   Reviewed-by: shade, ccheung
 - 8254369: Node::disconnect_inputs may skip precedences
   
   disconnect_inputs() needs to iterate precedences edges in reverse order because rm_prec(i) may backfill _in[i] with a
   value afterward. also remove the predicate if (n != NULL) in set_prec because it's always true.
   
   Reviewed-by: kvn, redestad
 - 8251325: Miss 'L' for long value in if statement
   
   Reviewed-by: iklam
 - 8254192: ExtraSharedClassListFile contains extra white space at end of line
   
   Reviewed-by: iklam, ccheung, mchung
 - 8254799: runtime/ErrorHandling/TestHeapDumpOnOutOfMemoryError.java fails with release VMs
   
   Reviewed-by: dholmes, dcubed, stuefe
 - 8254811: JDK-8254158 broke ppc64, s390 builds
   
   Reviewed-by: stuefe, goetz
 - 8249878: jfr_emergency_dump has secondary crashes
   
   Reviewed-by: egahlin
 - 8254674: G1: Improve root location reference to dead obj verification message
   
   Reviewed-by: sjohanss, lkorinth
 - 8254719: ZGC: Clean up includes
   
   Reviewed-by: stefank
 - ... and 15 more: https://git.openjdk.java.net/valhalla/compare/99696d60...63391b87

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

Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/227/files
  - new: https://git.openjdk.java.net/valhalla/pull/227/files/99696d60..63391b87

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=227&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=227&range=00-01

  Stats: 296921 lines in 439 files changed: 294014 ins; 1482 del; 1425 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/227.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/227/head:pull/227

PR: https://git.openjdk.java.net/valhalla/pull/227