[NativeAOT] Possible perf improvements in casting

[VSadov]

CoreClr appears to have faster casting helpers than NativeAOT. #84430 (comment)

That means the NativeAOT helpers could likely be improved, since conceptually they should be applying similar logic.
It is worth compare the code of the helpers and related typesystem bits to see what can be copied/unified from whichever is a faster implementation.

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Issue Details

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CoreClr appears to have faster casting helpers than in NativeAOT. #84430 (comment)

That means the NativeAOT helpers could likely be improved, since conceptually they should be applying similar logic.
It is worth compare the code of the helpers and related typesystem bits to see what can be copied/unified form the faster implementation.

Author:	VSadov
Assignees:	-
Labels:	untriaged, area-NativeAOT-coreclr
Milestone:	-