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Clean up / speed up various SIMD functions

Frank Bossen requested to merge bossen/VVCSoftware_VTM:simd1 into master

  • In InterPrediction::rightShiftMSB, use existing floorLog2 function

  • In addAvg_SSE, avoid unnecessary use of 32-bit path

  • In copyBufferSimd, reduce number of loops

  • In paddingSimd, take advantage of padding extent being either 1 or 2

  • In addBIOAvg4_SSE, reduce number of operations and avoid nasty Xmm register -> memory -> integer register path

Overall, a decoder runtime reduction of about 3% is expected

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