RFR: 8343767: Enumerate StubGen blobs, stubs and entries and generate code from declarations [v10]

[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 60 commits:

 - correct errors in stubgen blob sizes
 - merge
 - increase compiler stub space for macos x86_64
 - adjust x86 blob sizes to allow for relocated stubs
 - fix issue with x86 avx3 array copy
 - Merge branch 'master' into iterate_stubs
 - fix element sizes in s390 copy routines
 - fix stub is and align flags for s390
 - fix comments and remove unused stubid on riscv
 - locate super lookup stubs in same blob for all arches
 - ... and 50 more: https://git.openjdk.org/jdk/compare/1ef77cdd...2bc580ce

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

Changes: https://git.openjdk.org/jdk/pull/21957/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21957&range=09
  Stats: 6950 lines in 57 files changed: 4066 ins; 1533 del; 1351 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