Proposed changes to the GC logging flags

[Y Srinivas Ramakrishna]

> This is what I get when I use PrintGCDateStamps and PrintGCTimeStamps
> 
> 2008-04-04T15:22:21.212-0500: 1697.534: [GC Before GC:
> 
> I would say since they are not mutually exclusive use them both.
> No need to debate.

Agreed :-)

-- ramki