RFR: 8367993: G1: Speed up ConcurrentMark initialization [v2]

[Leo Korinth]

> This change moves almost all of the ConcurrentMark initialisation from its constructor to the method `G1ConcurrentMark::fully_initialize()`.  Thus, creation time of the VM can be slightly improved by postponing creation of ConcurrentMark. Most time is saved postponing creation of statistics buffers and threads.
> 
> It is not obvious that this is the best solution. I have earlier experimented with lazily allocating statistics buffers _only_. One could also initialise a little bit more eagerly (for example the concurrent mark thread) and maybe get a slightly cleaner change. However IMO it seems better to not have ConcurrentMark "half initiated" with a created mark thread, but un-initialised worker threads.
> 
> This change is depending on the integration of https://bugs.openjdk.org/browse/JDK-8373253.
> 
> I will be out for vacation, and will be back after new year (and will not answer questions during that time), but I thought I get the pull request out now so that you can have a look.

Leo Korinth has updated the pull request incrementally with 561 additional commits since the last revision:

 - Merge branch 'master' into _8367993
 - 8366058: Outdated comment in WinCAPISeedGenerator
   
   Reviewed-by: mullan
 - 8357258: x86: Improve receiver type profiling reliability
   
   Reviewed-by: kvn, vlivanov
 - 8373704: Improve "SocketException: Protocol family unavailable" message
   
   Reviewed-by: lucy, jpai
 - 8373722: [TESTBUG] compiler/vectorapi/TestVectorOperationsWithPartialSize.java fails intermittently
   
   Reviewed-by: jiefu, jbhateja, erfang, qamai
 - 8343809: Add requires tag to mark tests that are incompatible with exploded image
   
   Reviewed-by: alanb, dholmes
 - 8374465: Spurious dot in documentation for JVMTI ClassLoad
   
   Reviewed-by: kbarrett
 - 8374317: Change GCM IV size to 12 bytes when encrypting/decrypting TLS session ticket
   
   Reviewed-by: djelinski, mpowers, ascarpino
 - 8374444: Fix simple -Wzero-as-null-pointer-constant warnings
   
   Reviewed-by: aboldtch
 - 8373847: Test javax/swing/JMenuItem/MenuItemTest/bug6197830.java failed because The test case automatically fails when clicking any items in the “Nothing” menu in all four windows (Left-to-right)-Menu Item Test and (Right-to-left)-Menu Item Test
   
   Reviewed-by: serb, aivanov, dnguyen
 - ... and 551 more: https://git.openjdk.org/jdk/compare/b907b295...0ece3767

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28723/files
  - new: https://git.openjdk.org/jdk/pull/28723/files/b907b295..0ece3767

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28723&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28723&range=00-01

  Stats: 130212 lines in 3962 files changed: 83750 ins; 29714 del; 16748 mod
  Patch: https://git.openjdk.org/jdk/pull/28723.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28723/head:pull/28723

PR: https://git.openjdk.org/jdk/pull/28723