ND scalar indexing in JIT. * src/jit-ir.cc (jit_magic_end::jit_magic_end): Use jit_magic_end::context. * src/jit-ir.h (jit_call::jit_call): New overload. (jit_magic_end::context): New class. (jit_magic_end::jit_magic_end): moved to src/jit-ir.cc. * src/jit-typeinfo.cc (octave_jit_paren_scalar): New function. (jit_typeinfo::jit_typeinfo): Generate ND scalar indexing. (jit_typeinfo::gen_subsref): New function. * src/jit-typeinfo.h (jit_typeinfo::gen_subsref): New declaration. * src/pt-jit.cc (jit_convert::visit_index_expression, jit_convert::do_assign): Update resolve call. (jit_convert::resolve): Resolve ND indices. * src/pt-jit.h (jit_convert::resolve): Change function signature.