RFR: 8339466: Enumerate shared stubs and define static fields and names via declarations [v2]

[Andrew Dinn]

> Systematize handling of SharedRuntime stubs. Generate enum ids, static fields and names from declarations using template macros. Systematically reference stubs and stub names using ids.

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

  fix errors in ppc generator

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20832/files
  - new: https://git.openjdk.org/jdk/pull/20832/files/84778be3..b5220093

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20832&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20832&range=00-01

  Stats: 8 lines in 1 file changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20832.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20832/head:pull/20832

PR: https://git.openjdk.org/jdk/pull/20832