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Post-modern CompareByte for x86-64/SSE2.

Rika requested to merge runewalsh/source:cb-pm-x64 into main

Copy of !397 (merged) with renamed registers etc.

Benchmark: CompareBytePostmodernBenchmarkX64.pas.

My results 🌼 
                              SSE2 (modern)    SSE2 (postmodern)
CompareByte(#0 / 1):           2.1 ns/call        1.7 ns/call
CompareByte(#6 / 7):           2.5 ns/call        2.1 ns/call
CompareByte(#14 / 15):         2.4 ns/call        2.1 ns/call
CompareByte(#30 / 31):         2.9 ns/call        2.4 ns/call
CompareByte(#1 / 100):         2.0 ns/call        1.8 ns/call
CompareByte(#50 / 100):        4.7 ns/call        3.5 ns/call
CompareByte(#99 / 100):        6.8 ns/call        5.1 ns/call
CompareByte(#100 / 200):       6.5 ns/call        5.1 ns/call
CompareByte(#199 / 200):        12 ns/call        6.5 ns/call
CompareByte(#500 / 1000):       32 ns/call         12 ns/call
CompareByte(#999 / 1000):       47 ns/call         20 ns/call
CompareByte(#5000 / 10000):    232 ns/call        124 ns/call
CompareByte(#9999 / 10000):    444 ns/call        251 ns/call
Edited by Rika

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