make pathiter bench a little more realistic

Touch the memory that the iterator returns, so we're (slightly) more
sure the compiler isn't eliding code we want to be timing.

Change-Id: I62eb36759413d83fb18f4a6e0bf23d4d98f11999
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/235860
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed