refactor ceil/floor log2 handling

Karsten Suehringrequested to merge
ksuehring/VVCSoftware_VTM:refactor_log2 into master
  • create ceilLog2() function based on floorLog2
  • use intrinsics for MSVC in floorLog2
  • replace all ceil(log2()) calls in HLS with ceilLog2()
  • replace g_aucLog2[] with floorLog2

First test results indicate no change in coding performance, maybe slightly longer run times (but could be jitter on the cluster).

Edited by Karsten Suehring

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