[JitDiff X64] [EgorBo] Replace unsafe SIMD/SWAR accesses with safe span-base ... #2179

ERROR: System.Exception: jitutils/bin/jit-diff diff --cctors --output jit-diffs/frameworks/pr --frameworks --pmi --core_root artifacts-pr --base clr-checked-pr failed with exit code 1
   at Runner.JobBase.RunProcessAsync(String fileName, String arguments, List`1 output, String logPrefix, String workDir, Boolean checkExitCode, Func`2 processLogs, Boolean suppressOutputLogs, Boolean suppressStartingLog, ProcessPriorityClass priority, List`1 envVars, CancellationToken cancellationToken) in /home/runtime-utils/Runner/JobBase.cs:line 520
   at Runner.Helpers.JitDiffUtils.RunJitDiffAsync(JobBase job, String coreRootFolder, String checkedClrFolder, String outputFolder, String frameworksOrAssembly, String logPrefix, List`1 output, CancellationToken cancellationToken) in /home/runtime-utils/Runner/Helpers/JitDiffUtils.cs:line 120
   at Runner.Helpers.JitDiffUtils.RunJitDiffOnFrameworksAsync(JobBase job, String coreRootFolder, String checkedClrFolder, String outputFolder) in /home/runtime-utils/Runner/Helpers/JitDiffUtils.cs:line 68
   at Runner.Jobs.JitDiffJob.CollectFrameworksDiffsAsync(Boolean skipMain) in /home/runtime-utils/Runner/Jobs/JitDiffJob.cs:line 360
   at Runner.Jobs.JitDiffJob.RunJobCoreAsync() in /home/runtime-utils/Runner/Jobs/JitDiffJob.cs:line 128
   at Runner.JobBase.RunJobAsync() in /home/runtime-utils/Runner/JobBase.cs:line 182