RFR: 8328383: Method is not used: com.sun.tools.javac.comp.Attr::thisSym

[Vicente Romero]

Please review this simple fix that is just removing a method not used by any client. As indicated in the title the method belong to class `com.sun.tools.javac.comp.Attr`

TIA

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Commit messages:
 - 8328383: Method is not used: com.sun.tools.javac.comp.Attr::thisSym

Changes: https://git.openjdk.org/jdk/pull/18566/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18566&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328383
  Stats: 7 lines in 1 file changed: 0 ins; 7 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18566.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18566/head:pull/18566

PR: https://git.openjdk.org/jdk/pull/18566