Implement SharedPtrDataLoader load_into

[CatNebulaaaa]

Summary

• Implement SharedPtrDataLoader::load_into using the loader's existing bounds and overflow validation.
• Reject null destination buffers consistently with the other data loaders.
• Add tests for successful copies, null destinations, and out-of-bounds requests.

Fixes #11562

Test plan

• Built and ran shared_ptr_data_loader_test.cpp against GoogleTest on WSL/Ubuntu 24.04 with GCC 13.3: 4 tests passed.
• git diff --check

AI usage

This change was developed with assistance from OpenAI Codex. I reviewed the resulting diff and ran the tests listed above.

[pytorch-bot]

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As of commit a3e6c96 with merge base 6a8eae9 ():

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• ✅ login: CatNebulaaaa / name: Pleiades (a3e6c96)

[Copilot]

Pull request overview

Implements SharedPtrDataLoader::load_into() so callers can copy data directly into a provided destination buffer, reusing the loader’s existing bounds/overflow validation and matching the null-destination behavior of other DataLoader implementations.

Changes:

• Add SharedPtrDataLoader::load_into() implementation that validates destination buffer and delegates range validation to load().
• Add unit tests covering null destination handling, successful copies, and out-of-bounds requests.

Reviewed changes

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

File	Description
extension/data_loader/shared_ptr_data_loader.h	Implements load_into() for SharedPtrDataLoader using existing validation and memcpy.
extension/data_loader/test/shared_ptr_data_loader_test.cpp	Adds tests for load_into() success, null destination, and invalid range handling.

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[CatNebulaaaa]

@pytorchbot label "release notes: none"

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