[clang] [clang] check deduction consistency when partial ordering function templates (PR #100692)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> Now I think these should cover all remaining issues we see after this commit (and up to the current ToT):
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> * Test case 1: https://gcc.godbolt.org/z/zMG5nsda3
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> * Test case 2: https://gcc.godbolt.org/z/YbTKzao7d
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> * Test case 3: https://gcc.godbolt.org/z/89Yn3d33G
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Thanks. I am looking into it.

https://github.com/llvm/llvm-project/pull/100692