SpanHelpers.ClearWithoutReferences has several invalid (unaligned) casts

[GrabYourPitchforks]

https://github.com/dotnet/corefx/blob/c86814f6b2ab6fee0848433bc379fba479041c0c/src/Common/src/CoreLib/System/SpanHelpers.cs#L45

It is invalid to reinterpret cast a ref byte to a ref ushort/uint/ulong without first checking the alignment of the input buffer. This could cause problems on future architectures or IOT devices where unaligned reads incur faults. This code should pin and check alignment or should use Unsafe.WriteUnaligned instead.

[ahsonkhan]

Moving to future.

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