CRR: 6885041: G1: inconsistent thread dump (XS)

[Tony Printezis]

Small changes to get the thread dump information for the G1 threads 
consistent with what other GCs do. The webrev is here:

http://cr.openjdk.java.net/~tonyp/6885041/webrev.0/

Tony

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| Tony Printezis, Staff Engineer   | Sun Microsystems Inc.          |
|                                  | MS UBUR02-311                  |
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