[foreign-jextract] RFR: 8251893: jextract does not generate source for ConstantHelper even when --source is used [v3]

[Athijegannathan Sundararajan]

> ConstantHelper.java is generated when --source is used

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last
revision:

  refactored constant segment, address as separate methods as suggesed in review.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/283/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/283/files/cca7ef8d..0f099b48

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/283/webrev.02
 - incr: https://webrevs.openjdk.java.net/panama-foreign/283/webrev.01-02

  Stats: 38 lines in 1 file changed: 17 ins; 10 del; 11 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/283.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/283/head:pull/283

PR: https://git.openjdk.java.net/panama-foreign/pull/283