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

[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.

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Commit messages:
 - typo
 - fix error in x86_32 generator
 - fix whitespace and error in x86 generator
 - 8339466: Enumerate shared stubs and define static fields and names via declarations

Changes: https://git.openjdk.org/jdk/pull/20832/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20832&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339466
  Stats: 458 lines in 11 files changed: 319 ins; 34 del; 105 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