drmemtrace view tool -skip_refs is under-counting

There is a regression in the view tool's -skip_refs option: it seems to be under-counting. Looking at the code, it looks like it's not counting timestamps, and maybe not the 1st two markers?

In one of our internal traces we have from -sim_refs 50 -skip_refs 14652041:

 14652070: T518446 ifetch 4 byte(s) @ 0x0000aaaac4938c4c ...
 14652071: T518446 read   8 byte(s) @ 0x000055ba341e3840 by PC 0x0000aaaac4938c4c
 14652072: T518446 ifetch 4 byte(s) @ 0x0000aaaac4938c50 ...

While viewing the entire thread has:

 14652070: T518446 <marker: timestamp 13286646752452591>
 14652071: T518446 ifetch 4 byte(s) @ 0x0000aaaac49e2b28 ...
 14652072: T518446 ifetch 4 byte(s) @ 0x0000aaaac49e2b2c ...