JVET-O0617: Significant flag context reduction of transform coefficients

Cheung Auyeungrequested to merge
Auyeung/VVCSoftware_VTM:JVET-O0617 into master

Merged JVET-O0617 for reducing the number of contexts of sig_coeff_flag in residual coding of transform coefficients.

Edited by Karsten Suehring

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