RFR: 8343767: Enumerate StubGen blobs, stubs and entries and generate code from declarations [v14]

[Andrew Dinn]

> Implementation of JDK-8343767

Andrew Dinn has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 68 commits:

 - bump up compiler blob size to allow for large code cache segment/alignment sizes
 - merge
 - update copyrights
 - remove unreferenced local var
 - allow repeated entries rather than stubs
 - correct error in stub routines fill test
 - remove unused ppc stub
 - fix errors in s390 arraycopy code
 - correct errors in stubgen blob sizes
 - merge
 - ... and 58 more: https://git.openjdk.org/jdk/compare/51cce6e6...cc85c18a

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Changes: https://git.openjdk.org/jdk/pull/21957/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21957&range=13
  Stats: 7098 lines in 57 files changed: 4053 ins; 1642 del; 1403 mod
  Patch: https://git.openjdk.org/jdk/pull/21957.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21957/head:pull/21957

PR: https://git.openjdk.org/jdk/pull/21957