Implement interpreter PInvoke Calli

[janvorli]

The Calli implementation was missing support for the case when the targer is a pinvoke. That resulted in errors due to incorrect GC mode. This change fixes that.

[Copilot]

Pull Request Overview

This PR implements missing PInvoke support for the interpreter's Calli (indirect call) functionality in the CoreCLR runtime. The implementation ensures proper GC mode handling when calling native functions through function pointers.

Key changes:

• Added a new InvokePInvokeCalliStub function that handles PInvoke calls with proper GC mode transitions
• Extended the Calli opcode to include PInvoke detection information
• Refactored Calli emission code to centralize the logic and include calling convention analysis

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/coreclr/vm/wasm/helpers.cpp	Added stub implementation of InvokePInvokeCalliStub for WASM platform
src/coreclr/vm/interpexec.cpp	Implemented InvokePInvokeCalliStub with proper GC transitions and updated Calli execution logic
src/coreclr/interpreter/intops.def	Extended Calli opcodes to include an additional parameter for PInvoke detection
src/coreclr/interpreter/compiler.h	Added declaration for new EmitCalli helper method
src/coreclr/interpreter/compiler.cpp	Implemented EmitCalli method and refactored call emission to use it

[pavelsavara]

I can see this again #123008

I'm runningSystem.Runtime.Tests in Release mode.