RFR: backport of 7903237: pointer to function struct member with the same name as struct crashes jextract

[Athijegannathan Sundararajan]

backport of 7903237: pointer to function struct member with the same name as struct crashes jextract

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Commit messages:
 - backport of 7903237: pointer to function struct member with the same name as struct crashes jextract

Changes: https://git.openjdk.org/jextract/pull/56/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=56&range=00
  Stats: 52 lines in 3 files changed: 48 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jextract/pull/56.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/56/head:pull/56

PR: https://git.openjdk.org/jextract/pull/56