RFR: 7903610: Missing handling for array fields with inline struct declaration [v2]

[Maurizio Cimadamore]

> This patch adds a new method in `Utils` which helps visitors to obtain a scoped declaration given a type. This is used whenever the visitor logic needs to recurse on a declared type e.g. in a variable, or a typedef. The current logic only tests for `Type.Declared` and, in doing so, misses some cases, such as arrays and typedefs which point back to a declared type.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Drop spurious test option

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Changes:
  - all: https://git.openjdk.org/jextract/pull/161/files
  - new: https://git.openjdk.org/jextract/pull/161/files/1a13ed97..846d4059

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=161&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=161&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jextract/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/161/head:pull/161

PR: https://git.openjdk.org/jextract/pull/161