Georg Wiese a22065ee2d Refactor QuadraticSymbolicExpression (#2923) ...

This PR refactors `QuadraticSymbolicExpression`: I removed the reference
to
[`SymbolicExpression`](f60e9d9f69/constraint-solver/src/quadratic_symbolic_expression.rs (L70)).
It can represent values that are known at runtime, represented as an
expression. We don't need this in the context of APC: Variables are
either unknown or known at compile time, and therefore can be
represented as a `FieldElement` instead.

The idea is to introduce [this
trait](4989be08f3/constraint-solver/src/runtime_constant.rs (L11)),
which is implemented by `SymbolicExpression` and any `T: FieldElement`.
This way, we can continue to use the solver with
`QuadraticSymbolicExpression<SymbolicExpression<T, V>, V>` (equivalent
to the current `QuadraticSymbolicExpression<T, V>`) in the old JIT
pipeline and use the simpler `QuadraticSymbolicExpression<T, V>` in the
APC pipeline.

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Co-authored-by: chriseth <chriseth.github@gmail.com>

2025-06-30 15:47:12 +00:00

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