RFR: 8159350: G1 String deduplication logging malformed

[Per Liden]

Hi,

Summary: The conversion to Unified Logging framework left an unmatched 
']' at the end of G1's string deduplication printouts.

Like this:

[13.742s][info][gc,stringdedup] Concurrent String Deduplication 
168.9M->168.9M(31.3K), avg 0.0%, 8.6307965 secs]


Webrev: http://cr.openjdk.java.net/~pliden/8159350/webrev.0/

Bug: https://bugs.openjdk.java.net/browse/JDK-8159350

cheers,
Per