RFR: 8257700: Add logging for sealed classes in JVM_GetPermittedSubclasses [v3]

[Harold Seigel]

> Please review this small fix for JDK-8257700 to add logging to JVM_GetPermittedSubclasses().  The fix was tested with Mach5 tiers 1 and 2 on Linux, MacOS, and WIndows, tiers 3-5 on Linux x64, and by running the hotspot runtime sealed tests with -Xlog:class+sealed=trace and looking at the output.
> 
> Thanks, Harold

Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:

  8257700: Add logging for sealed classes in JVM_GetPermittedSubclasses

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1780/files
  - new: https://git.openjdk.java.net/jdk/pull/1780/files/4cb2719d..7883a52a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1780&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1780&range=01-02

  Stats: 4 lines in 1 file changed: 1 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1780.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1780/head:pull/1780

PR: https://git.openjdk.java.net/jdk/pull/1780