[foreign-jextract] RFR: 8257892: long double not handled by jextract [v3]

[Athijegannathan Sundararajan]

> added UnsupportedLayouts and checking/warning all unsupported types uniformly

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

  Changes based on review. Added a new test to exercise 'long double' (seen in samples) in various contexts.
  Avoid CLinker references from UnsupportedLayouts. Using a (private) attribute for unsupported layouts.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/409/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/409/files/59ed31a4..0311fc51

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=409&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=409&range=01-02

  Stats: 214 lines in 6 files changed: 201 ins; 3 del; 10 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/409.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/409/head:pull/409

PR: https://git.openjdk.java.net/panama-foreign/pull/409