RFR: 8278643: CoreUtils.getCoreFileLocation() should print out the size of the core file found

[Chris Plummer]

Include the size of the core file when printing a message that it was found.

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Commit messages:
 - Print the size of the core file found

Changes: https://git.openjdk.java.net/jdk/pull/6822/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6822&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278643
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6822.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6822/head:pull/6822

PR: https://git.openjdk.java.net/jdk/pull/6822