[jdk13u-dev] Integrated: 8247964: All log0() in com/sun/org/slf4j/internal/Logger.java should be private

[Yuri Nesterenko]

Second backport related to logging. Clean patch.

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Commit messages:
 - Backport f834dc3dc9c7e36ee5173f229c6a4ef7903b73df

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/317/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=317&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247964
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/317.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/317/head:pull/317

PR: https://git.openjdk.java.net/jdk13u-dev/pull/317