RFR: 7903253: sync jextract tests for sequence layout factory split

Avoid -1 elementCount for Sequence layout factory call. ------------- Commit messages: - 7903253: sync jextract tests for sequence layout factory split Changes: https://git.openjdk.org/jextract/pull/61/files Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=61&range=00 Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903253 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jextract/pull/61.diff Fetch: git fetch https://git.openjdk.org/jextract pull/61/head:pull/61 PR: https://git.openjdk.org/jextract/pull/61