[clr-ios] Implement Swift calling convention in CoreCLR interpreter

[kotlarmilos]

Description

Add Swift calling convention support to callstubgenerator.cpp. This includes implementing Swift-specific argument passing, lowering of arguments and return types. The goal is to emit correct call stubs so that CoreCLR interpreter can interoperate directly with Swift.

Tasks

• [clr-interp] Add Swift calling convention support to CoreCLR interpreter on arm64 #123142
• Implement UnmanagedCallersOnly support
• Implement x64 support

[MihuBot]

I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

• Introduce CallConvSwift to represent the Swift ABI calling convention #64215
• Introduce CallConvSwift and special register types to represent the Swift ABI calling convention #95065

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