[PATCH] [lnt] Correct delta and percent-change of geometric mean.

[Daniel Sanders via llvm-commits]

The geometric mean of a dataset is not the samples it is calculated from.
It is a single calculated sample. Without this patch, the delta and percent
change fields will pick the individual test with the smallest value change
and calculate their value from that, producing very misleading results.
It should show the delta/percent-change of the geometric mean itself.
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