llvm / llvm/circt

[Arc] Add basic assertion support

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@elhewaty is already working on this.

Since Mar 11, 2024.

Arc good first issue
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Description

Add support for `verif.assert` and `sv.assert.concurrent` operations to the Arc dialect and passes. When lowering towards LLVM, the asserts should lower to an `scf.if` operation that checks whether their condition holds, and if it does not, calls a callback function (or aborts with a message for starters).

This is likely to uncover a lot of details about how clocked and unclocked asserts need to be handled, and where they have to be scheduled and checked in the simulation model.

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