[foreign-jextract] RFR: 8264397: Use the blessed modifier order in jdk.incubator.foreign

[Alex Blewitt]

Let me know if this is the right branch to apply to; I can submit this change against a different branch if needed.

This replaces https://github.com/openjdk/jdk/pull/3253

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Commit messages:
 - 8264397: Use the blessed modifier order in jdk.incubator.foreign

Changes: https://git.openjdk.java.net/panama-foreign/pull/486/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=486&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264397
  Stats: 19 lines in 9 files changed: 0 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/486.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/486/head:pull/486

PR: https://git.openjdk.java.net/panama-foreign/pull/486