[RyuJIT WASM] Add GT_NO_OP and GT_NOP handlers to genCodeForTreeNode

[Copilot]

The WASM codegen was missing handlers for GT_NO_OP and GT_NOP node types in CodeGen::genCodeForTreeNode, causing failures when these nodes were encountered during code generation.

Changes

• GT_NOP: Added case that breaks immediately (marker-only node, emits no code)
• GT_NO_OP: Added case that emits INS_nop instruction (non-deletable NOP)

Implementation matches existing patterns across x86, ARM, and RISC-V architectures.

case GT_NOP:
    break;

case GT_NO_OP:
    instGen(INS_nop);
    break;

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[RyuJIT Wasm] Missing handler for GT_NO_OP</issue_title>
<issue_description>CodeGen::genCodeForTreeNode needs to be updated with a case for GT_NO_OP that emits an INS_nop. It also needs a case for GT_NOP that does nothing.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [RyuJIT Wasm] Missing handler for GT_NO_OP #122327

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[dotnet-policy-service]

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

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.