[clr-interp] Intrinic handling for Delegate Invoke methods

[davidwrighton]

• Add a new opcode
• Add a new invocation method. Note that this needs to have the same copy the CallStubHeader logic as calli, as the target is not consistent from use to use

[Copilot]

Pull Request Overview

This PR implements intrinsic handling for delegate Invoke methods in the CoreCLR interpreter by introducing a specialized execution path for delegate invocations. The changes optimize delegate calls by avoiding generic method dispatch overhead.

Key changes:

• Adds a new INTOP_CALLDELEGATE opcode specifically for delegate invoke operations
• Implements InvokeDelegateInvokeMethod function that handles delegate-specific invocation logic
• Updates the compiler to detect and emit the new opcode for delegate invoke methods

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/vm/interpexec.cpp	Adds InvokeDelegateInvokeMethod function and INTOP_CALLDELEGATE case handler
src/coreclr/interpreter/intops.def	Defines the new INTOP_CALLDELEGATE opcode
src/coreclr/interpreter/compiler.cpp	Updates compiler to detect delegate invoke methods and emit the new opcode

[janvorli]

LGTM, thank you!

[jkotas]

Test failure looks related to the PR:

System.Exception: Interpreted App failed execution
at InterpreterTester.RunTests()