chore: remove GeneratedAcir.current_witness_index

Author: TomAFrench

compiler/noirc_evaluator/src/acir/acir_context/generated_acir/mod.rs

@@ -95,11 +95,6 @@ pub(crate) type BrilligOpcodeToLocationsMap = BTreeMap<BrilligOpcodeLocation, Ca
 pub(crate) type BrilligProcedureRangeMap = BTreeMap<ProcedureDebugId, (usize, usize)>;
 
 impl<F: AcirField> GeneratedAcir<F> {
-    /// Returns the current witness index.
-    pub fn current_witness_index(&self) -> Witness {
-        Witness(self.current_witness_index.unwrap_or(0))
-    }
-
     /// Adds a new opcode into ACIR.
     pub(crate) fn push_opcode(&mut self, opcode: AcirOpcode<F>) {
         self.opcodes.push(opcode);