Add a 'flag_ptr' field to CommandLineFlagInfo that points to the current storage of the flag (i.e. &FLAGS_foo).

R=csilvers
DELTA=15  (15 added, 0 deleted, 0 changed)


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git-svn-id: https://gflags.googlecode.com/svn/trunk@67 6586e3c6-dcc4-952a-343f-ff74eb82781d