RFR: 8369993: Redundant separate 'String' check in 'trust_final_non_static_fields' ciField.cpp

[Zihao Lin]

Remove redundant separate 'String' check in 'trust_final_non_static_fields' ciField.cpp

-------------

Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/28191/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28191&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369993
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28191.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28191/head:pull/28191

PR: https://git.openjdk.org/jdk/pull/28191