Use 64 bit Sum for planar function to remove size limitation BUG=302 TESTED=out\release\libyuv_unittest --gtest_filter=*Psnr R=tpsiaki@google.com
Use 64 bit Sum for planar function to remove size limitation
BUG=302
TESTED=out\release\libyuv_unittest --gtest_filter=*Psnr
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6499004
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