[clr-interp] Implement tail-calling for delegates and support for delegates in wasm

[davidwrighton]

• Disable shuffle thunk creation for portable entrypoints and enable ILDelegateShuffle thunks instead
• Also implement the shuffle thunk in the interpreter directly so that most cases don't need to even use those in WASM or cases where we have pregenerated code
• Add a new opcode for tail-calling a delegate method

[Copilot]

Pull Request Overview

This PR implements tail-calling for delegates in the CLR interpreter and enables delegate support in WebAssembly by modifying how delegate shuffle thunks are handled.

• Adds a new INTOP_CALLDELEGATE_TAIL opcode for tail-calling delegate methods
• Disables shuffle thunk creation for portable entrypoints and enables IL delegate shuffle thunks instead
• Implements shuffle thunk logic directly in the interpreter to avoid needing shuffle thunks for most WASM cases

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/vm/interpexec.cpp	Implements tail-call delegate handling and direct shuffle thunk execution in interpreter
src/coreclr/vm/comdelegate.cpp	Disables portable shuffle array generation and enables IL delegate shuffle thunks for portable entrypoints
src/coreclr/interpreter/inc/intops.def	Adds new INTOP_CALLDELEGATE_TAIL opcode definition
src/coreclr/interpreter/compiler.cpp	Emits INTOP_CALLDELEGATE_TAIL opcode for tail-call delegate invocations

[kg]

Looks right other than Copilot's comment pointing out the potential null dereference for static delegates

[Copilot]

Pull Request Overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[janvorli]

LGTM, thank you!