RFR: 8258792: LogCompilation: remove redundant check fixed by 8257518

[Eric Caspole]

There is no need to do the same check again doing -U processing, it is already done during XML parsing.

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Commit messages:
 - 8258792:LogCompilation: remove redundant check fixed by 8257518

Changes: https://git.openjdk.java.net/jdk/pull/1860/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1860&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258792
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1860.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1860/head:pull/1860

PR: https://git.openjdk.java.net/jdk/pull/1860