[JitDiff ARM64] [xtqqczze] Refactor memory copies in `SafeBuffer`

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Job completed in 18 minutes.
dotnet/runtime#105206

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@xtqqczze

[xtqqczze]

@MihaZupan

[00:13:37] [main checked] Build FAILED.
[00:13:37] [main checked] 
[00:13:37] [main checked] /ramdisk/runtime/.dotnet/sdk/9.0.100-preview.5.24307.3/NuGet.RestoreEx.targets(19,5): error : Static graph-based restore failed with exit code '1' but did not log an error. Please file an issue at https://github.com/NuGet/Home. [/ramdisk/runtime/Build.proj]