Fix segfault with Ptr<T> extension using 'This' type reference (#7719)

* Fix segfault with Ptr<T> extension using 'This' type reference

Set LookupOptions::NoDeref when looking up target type members within
extension declarations to prevent automatic pointer dereferencing that
was causing breadcrumb handling issues and segfaults.

Fixes #7656

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

* Enhance test for ptr-extension-this-type to verify correctness with interpreter

- Changed function to return sizeof(This) - sizeof(Ptr<int>) + 1
- Modified test to use interpreter with filecheck to verify result equals 1
- Added main() function that calls the extension method and prints result
- Verifies that 'This' correctly refers to Ptr<int> in extension context

Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Yong He <csyonghe@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions