RFR: 8240567: MethodTooLargeException thrown while creating a jlink image [v8]

[Oliver Kopp]

> Fix for [JDK-8240567](https://bugs.openjdk.org/browse/JDK-8240567): "MethodTooLargeException thrown while creating a jlink image".
> 
> Java still has a 64kb limit: A method may not be longer than 64kb. The idea of the fix is to split up the generated methods in several smaller methods
> 
> This is a follow-up to https://github.com/openjdk/jdk/pull/10704. GitHub did not allow me to re-open the PR, because I did a force-push to have one commit.

Oliver Kopp has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:

 - Merge remote-tracking branch 'upstream/master' into fix-8240567
   
   # Conflicts:
   #	src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModulesPlugin.java
 - Add description
 - Fix nit (indent)
 - Add parameterization for the number of moduleDescriptors per helper method (was magic number 50 / 75 before)
 - Fix threshold
 - Merge branch 'openjdk:master' into fix-8240567
 - Merge remote-tracking branch 'upstream/master' into fix-8240567
 - Merge remote-tracking branch 'upstream/master' into fix-8240567
 - Remove "final" at "enabled" - not part of the point of this PR
 - Remove comments
 - ... and 1 more: https://git.openjdk.org/jdk/compare/09a49240...a6c9c985

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Changes: https://git.openjdk.org/jdk/pull/14408/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14408&range=07
  Stats: 257 lines in 2 files changed: 244 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/14408.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14408/head:pull/14408

PR: https://git.openjdk.org/jdk/pull/14408