Fix GC holes in array marshallers in the field scenario (dotnet/coreclr#27562)
* Correctly protect references to objects in manually-managed code called by IL marshalers in the field scenarios. Use RuntimeHelpers.GetRawData to simplify layout class marshalling. * Add additional protects for SAFEARRAY marshalling when used in the field scenario. * Remove dead code. * Fix possible GC hole from order of argument evaluation. * Don't clean up fields on a managed object when there's no managed object. Commit migrated from https://github.com/dotnet/coreclr/commit/e658b97990f77dca2dba446386e9d8d4d71556e1
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