[foreign-jextract] RFR: 8267504: jextract should report unsupported language and exit rather than generating partial nonworking code [v3]

[Athijegannathan Sundararajan]

> Piggybacking to remove unused code. Avoid hardcoding enum values - using generated code instead.

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

  Few samples failed to work. Exposing all attribute cursor kinds. Tolerate "Invalid" language type (for example "packed")

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/539/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/539/files/a10d1b37..0d2ce8da

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=539&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=539&range=01-02

  Stats: 6 lines in 2 files changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/539.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/539/head:pull/539

PR: https://git.openjdk.java.net/panama-foreign/pull/539