Function cranelift_codegen_meta::cdsl::xform::rewrite_expr

fn rewrite_expr(
    position: PatternPosition, 
    dummy_expr: DummyExpr, 
    symbol_table: &mut HashMap<String, VarIndex>, 
    input_vars: &mut Vec<VarIndex>, 
    var_pool: &mut VarPool, 
    const_pool: &mut ConstPool
) -> Apply

Find all uses of variables in expr and replace them with our own local symbols.