As part of JDK-8003853, emit_to_interp_stub sizing was changed from

    start_a_stub(Compile::MAX_stubs_size);

to

    start_a_stub(to_interp_stub_size()*2);

In retrospect, it seems better to use

    start_a_stub(to_interp_stub_size());

and check at the end that the size was big enough, like PPC does:

     assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");

or make sure a similar check is part of end_a_stub().

We also need to make sure Compile::MAX_stubs_size is big enough.  If we wanted to make sure it was always big enough, we could change it from an enum to a variable, and do:

Compile::MAX_stubs_size = MAX(Compile::MAX_stubs_size, to_interp_stub_size());