Change RhpGcAlloc size argument type to intptr_t for consistency

[jkotas]

No description provided.

[Copilot]

Pull Request Overview

This PR changes the type of the numElements parameter in RhpGcAlloc from uintptr_t to intptr_t for consistency across the codebase. This aligns the parameter type with how the value is actually used, particularly in array allocation scenarios where negative values are checked for overflow conditions.

Key changes:

• Update function signature in implementation files
• Update corresponding comments in assembly files

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

File	Description
src/coreclr/vm/gchelpers.cpp	Updates RhpGcAllocMaybeFrozen function signature parameter type
src/coreclr/nativeaot/Runtime/portable.cpp	Updates RhpGcAlloc declaration and AllocateObject function signature
src/coreclr/nativeaot/Runtime/GCHelpers.cpp	Updates RhpGcAlloc function signature in implementation
Multiple assembly files	Updates function signature comments in various architecture-specific allocation helpers

[jkotas]

Implementations check for less than zero in number of places: https://github.com/dotnet/runtime/pull/119691/files#diff-547cf137c0fe434ed40dcf035ff12ee3fe81180847cb5851ec67667c0d0e8701R143-R144 . These places checked are unreachable with uintptr_t argument type. I do not think that this is fixing any real bug, but it is changing the exact exception message in some cases.

[jkotas]

cc @filipnavara

[jkotas]

@radekdoulik I have noticed this while reviewing your PR