Generate ND indexing functions on demand in JIT. * src/jit-typeinfo.cc (jit_operation::~jit_operation, jit_operation::do_generate, jit_operation::generate, jit_operation::signature_cmp::operator()): New function. (jit_operation::overload): Call do_generate when lookup fails. (jit_index_operation, jit_paren_subsref, jit_paren_subsasgn): New class. (jit_typeinfo::jit_typeinfo): Update to use jit_paren_subsref and jit_paren_subsasgn. (jit_typeinfo::gen_subsref, jit_typeinfo::gen_subsasgn): Removed functions. * src/jit-typeinfo.h (jit_operation::~jit_operation, jit_operation::generate, jit_operation::do_generate): New declaration. (jit_operation::add_overload, jit_operation::overload, jit_operation::result, jit_operation::to_idx): Use signature_vec typedef. (jit_operation::singature_cmp): New class. (jit_index_operation, jit_paren_subsref, jit_paren_subsasgn): New class. (jit_typeinfo::get_scalar_ptr): Nwe function. (jit_typeinfo::gen_subsref, jit_typeinfo::gen_subsasgn): Removed declaration. * src/pt-jit.cc: New test.

#include <iostream>
#include <octave/oct.h>

int
main (void)
{
  std::cout << "Hello Octave world!\n";
  int n = 2;
  Matrix a_matrix = Matrix (n, n);
  for (octave_idx_type i = 0; i < n; i++)
    {
      for (octave_idx_type j = 0; j < n; j++)
        {
          a_matrix (i, j) = (i + 1) * 10 + (j + 1);
        }
    }
  std::cout << a_matrix;
  return 0;
}