[foreign-jextract] RFR: 8251943: jextract should not generate MemorySegment typed fields for variables, struct fields if layout size info is not available [v2]

[Athijegannathan Sundararajan]

> problematic variables, struct/union fields are ignored with a warning.

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

  Added a test

-------------

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/284/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/284/files/3be5201c..b246a880

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/284/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/284/webrev.00-01

  Stats: 87 lines in 2 files changed: 87 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/284.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/284/head:pull/284

PR: https://git.openjdk.java.net/panama-foreign/pull/284