JIT: Handle byref<->nint casts on addresses in local morph

[jakobbotsch]

Fix #99759

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[jakobbotsch]

cc @dotnet/jit-contrib PTAL @EgorBo

Diffs

[Copilot]

Pull Request Overview

This PR fixes issue #99759 by adding proper handling of byref-to-nint and nint-to-byref casts on addresses during local morphing in the JIT compiler. The change ensures that cast operations between these pointer-like types are correctly processed in the LocalAddressVisitor without causing addresses to escape unnecessarily.

Key changes:

• Added GT_CAST case handling in LocalAddressVisitor to process byref<->nint casts on addresses
• Minor comment formatting fix in importer.cpp

Reviewed Changes

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

File	Description
src/coreclr/jit/lclmorph.cpp	Added GT_CAST case to handle byref<->nint casts on addresses in LocalAddressVisitor
src/coreclr/jit/importer.cpp	Fixed comment formatting by adding missing "//"