[wasm][coreclr] Fix prestub of methods with IL helper stubs

[radekdoulik]

Fix#121955

[dotnet-policy-service]

Tagging subscribers to this area: @agocke
See info in area-owners.md if you want to be subscribed.

[Copilot]

Pull request overview

This PR fixes a WASM/CoreCLR interpreter prestub issue where methods implemented via managed IL helper stubs could end up publishing an entrypoint that maps to the helperMethodDesc, breaking MethodDesc lookups and access checks (manifesting as MethodAccessException, e.g. around delegate construction).

Changes:

• Update MethodDesc::DoPrestub (FCall + managed-impl + portable entrypoints) to publish this method’s own PortableEntryPoint and attach interpreter data to it, instead of reusing the helper’s portable entrypoint.
• Enable interpreter callsite access-check callouts on WASM by removing the #ifndef TARGET_WASM guard.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/vm/prestub.cpp	Publishes the current method’s portable entrypoint and sets interpreter data for managed FCall helper-stub scenarios.
src/coreclr/interpreter/compiler.cpp	Enables emitting callsite access-check callouts on WASM by removing a WASM-only compile-time exclusion.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.