Simulator stack size check is wrong

[ohmtech-rdi]

We were assuming incorrectly that the stack was 512K, when it is only 128K.

In the simulator version of the module, we make a check for the size of the module structure.

Adapt the check so that if the structure is more than 128K, then we know that it is too much:

• There is also the stack use for functions anyway,
• We can't be really precise because the memory layout on x86_64 will most likely be different than on arm 32-bit.