Specially consider CLong, CULong and Guid strictly blittable #88213
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This PR makes
CLong,CULong, andSystem.Guidalways considered strictly blittable.CLongandCULongare interop intrinsic types, andGuidis used extremely often in COM scenarios and will never change to be non-blittable. This PR also establishes a policy for determining when the team may consider to add a type to this list (expected to be rare if ever).Fixes #73975
Fixes #87894