[foreign-jextract] RFR: 8257892: long double not handled by jextract [v5]

[Athijegannathan Sundararajan]

> added UnsupportedLayouts and checking/warning all unsupported types uniformly

Athijegannathan Sundararajan has updated the pull request incrementally with two additional commits since the last revision:

 - function pointers that use unsupported types should be filtered & warned as well.
 - inlined OutputFactory.warnUnsupported in visitFunction for clarity.

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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/0ff694ad..f2522cd5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=409&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=409&range=03-04

  Stats: 33 lines in 3 files changed: 21 ins; 4 del; 8 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