[foreign-jextract] RFR: 8253003: jextract clang wrapper code should avoid Addressable.address() call as much as possible

[Athijegannathan Sundararajan]

removed .address calls in libclang wrapper code.

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Commit messages:
 - 8253003: jextract clang wrapper code should avoid Addressable.address() call as much as possible

Changes: https://git.openjdk.java.net/panama-foreign/pull/316/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=316&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253003
  Stats: 14 lines in 4 files changed: 1 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/316.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/316/head:pull/316

PR: https://git.openjdk.java.net/panama-foreign/pull/316