Use local variables for line fit stats accumulation #405
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Allows them to be stored in CPU registers and avoids memcopy-ing the struct (cherry picked from commit e504236)
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Another performance optimization for quad fitting. Using local variables for the line fitting statistics allows them to be stored in CPU registers and avoids memcopy-ing the struct. This speeds up quad fitting from 46.6ms to 43.7ms averaged over 100 runs on my 6MP test image with 51 tags.