RFR: 8377554: Load card table base and other values via AOTRuntimeConstants in AOT code [v6]

[Andrew Dinn]

> Generated stubs and nmethods embed some runtime-derived constants, such as the card table base, directly into code as instruction operands. AOT code generation cannot rely on these constants being valid between the assembly run and a production run and adjusting the constants at load time is not currently supported. So, instead AOT generation must employ code which loads the constants from a table whose address can be relocated at load time.

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

  handle external_word reloc on C2 RawPtr constants

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29884/files
  - new: https://git.openjdk.org/jdk/pull/29884/files/c46604af..e798100f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29884&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29884&range=04-05

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29884.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29884/head:pull/29884

PR: https://git.openjdk.org/jdk/pull/29884