Using LibraryImport instead of DllImport?

[rmsimpson]

I ran a few benchmarks on my system, found the summaries interesting. I rebuilt the code with .NET Core 9.0-Preview 2, then ran these benchmarks:

• Default with no changes
• Removing the SuppressGCTransition attribute
• Switching to LibraryImport
• Setting DisableRuntimeMarshalling attribute

Short version: LibraryImport won handily on the 1,000,000 byte test

Summary default.txt
Summary with GC.txt
Summary with LibraryImport.txt
Summary with LibraryImport_DisableRuntimeMarshalling.txt

[xoofx]

Yep, LibraryImport is much better, especially for string marshalling, PR welcome!