[qt/clang/llvm-project]: Summary of bulk changes made

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Git repository change summary for qt/clang/llvm-project
Pushed by mirror-service into branch 'upstream/release/23.x'.
Changed from 9d3cf1dff4dd8b3ef857f85cbdf7584fb901c7ce to 683799a69d579f21573424615e1a587a5b1b83aa
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit d82b356e26bf6fc175b01b949fd3982084b1c572 by llvmbot (on behalf of Ryan Buchner) on 29/07/2026 at 18:02..
[CodeGen] Ensure `undef` propagation when an undef copy is eliminated if used as a subregister def (#204039)

If we eliminate an `undef` copy and there is a use of the copy that
`isDef` on just a sub-register, mark it as `undef`.

Fixes #204036.

(cherry picked from commit c85d1c54c5fba6344b117e369328a4b9b5a1386b)
https://invent.kde.org/qt/clang/llvm-project/-/commit/d82b356e26bf6fc175b01b949fd3982084b1c572

Git commit 683799a69d579f21573424615e1a587a5b1b83aa by Tobias Hieta (on behalf of Nathan Ridge) on 30/07/2026 at 05:53..
[clangd] Clarify release note about skipping preamble builds when using modules
https://invent.kde.org/qt/clang/llvm-project/-/commit/683799a69d579f21573424615e1a587a5b1b83aa
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