[llvm] ConstraintSystem: replace data structure with Matrix (PR #98895)

[Ramkumar Ramachandra via llvm-commits]

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+//===- Matrix.h - Two-dimensional Container with View -----------*- C++ -*-===//
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artagnon wrote:

Possible, since it's header-only. I would like some other opinions as well.

https://github.com/llvm/llvm-project/pull/98895