asm: assembly code for pixel_satd_64x32 and pixel_satd_64x48
asm: assembly code for pixel_satd_64x64
asm: assembly code for pixel_satd_32x64 and pixel_satd_48x64
Unit test code for Pixel scaling
asm: code for scale1D_128to64 routine
reverted chroma_copy_pp asm integration code, avoiding csp break
no-rdo early exit: giving weightage to the cost of that CU and neighbour CU's for early exit

Early exit is done when CU cost at depth "n" is lessthan sum of 60% of avgcost of
that CU at same depth and 40% of avgcost of neighbour CU's at same depth.

the performance, bitrate increase and psnr comparison are given below
CLI: x265.exe input.y4m -o abc.hevc -r recon.y4m --rd 1 --ref 1

BasketballDrive_1920x1080_50
Timetaken to encode: 704/585/564s
bitrate: 3650/3696/3696
PSNR: 36.7/36.67/36.67
perf improvement: 16.9% (compared to early exit OFF and already existing early exit)
perf improvement: 19.8% (compared to early exit OFF and new early exit)

Cactus_1920x1080_50
Timetaken to encode: 526/443/436s
bitrate: 2787/2831/2833
PSNR: 35.527/35.48/35.48
perf improvement: 15.7% (compared to early exit OFF and already existing early exit)
perf improvement: 17.1% (compared to early exit OFF and new early exit)

Kimono1_1920x1080_24
Timetaken to encode: 279/235/238s
bitrate: 1243/1252/1252
PSNR: 38.16/38.158/38.159
perf improvement: 15.7% (compared to early exit OFF and already existing early exit)
perf improvement: 14.6% (compared to early exit OFF and new early exit)

FourPeople_1280x720_60
Timetaken to encode: 169/157/157s  16.9%/19.8%
bitrate: 486/489/489
PSNR: 39.09/39.052/39.042
perf improvement: 7.1% (compared to early exit OFF and already existing early exit)
perf improvement: 7.1% (compared to early exit OFF and new early exit)

big_buck_bunny_360p24
Timetaken to encode: 1739/1511/1505s  16.9%/19.8%
bitrate: 174.9/175.38/175.5
PSNR: 37.798/37.746/37.752
perf improvement: 13.1% (compared to early exit OFF and already existing early exit)
perf improvement: 13.4% (compared to early exit OFF and new early exit)

PartyScene_832x480_50
Timetaken to encode: 123/120/120s  16.9%/19.8%
bitrate: 208/208/208
PSNR: 40.344/40.33/40.332
perf improvement: 2.4% (compared to early exit OFF and already existing early exit)
perf improvement: 2.4% (compared to early exit OFF and new early exit)
asm: assembly code for calcrecon[]