[foreign-jextract] RFR: 8264887: Implicit scope objects are used with resource try

[Athijegannathan Sundararajan]

inspected the uses of implicit, confined scopes for correctness.

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Commit messages:
 - 8264887: Implicit scope objects are used with resource try

Changes: https://git.openjdk.java.net/panama-foreign/pull/492/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=492&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264887
  Stats: 7 lines in 1 file changed: 0 ins; 4 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/492.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/492/head:pull/492

PR: https://git.openjdk.java.net/panama-foreign/pull/492