RFR: 8343767: Enumerate StubGen blobs, stubs and entries and generate code from declarations [v7]

[Andrew Dinn]

> Implementation of JDK-8343767

Andrew Dinn has updated the pull request incrementally with one additional commit since the last revision:

  adjust x86 blob sizes to allow for relocated stubs

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21957/files
  - new: https://git.openjdk.org/jdk/pull/21957/files/e1f41d34..8497b11e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21957&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21957&range=05-06

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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