[llvm] Introduction of Composite Profile section in ExtBinary format (PR #166553)

[Sergey Shcherbinin via llvm-commits]

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SergeyShch01 wrote:

Good point. In the latest update, every profile passed to the script is explicitly pinned to v105.

The script produces nine derived v105 test profiles from four primary binary inputs and one donor profile. These cover malformed payload boundaries, duplicate and unknown blocks, empty sections, and mixed legacy/composite sections. With the input version pinned to v105, this is logically equivalent to checking in nine derived binary fixtures.

If separate binary fixtures are still preferred, I can check them in directly instead.

https://github.com/llvm/llvm-project/pull/166553