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

[Snehasish Kumar via llvm-commits]

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snehasish wrote:

Instead of a script can we just check in one malformed composite profile? I'm not sure we want to add the burden of maintaining a separate script if / when the profile format evolves. 

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