VM build fails when using C-reserved words as temp variable names

[nrainhart]

While working on bytecode operations (see initializeBytecodeTableForSistaV1), I used register as a temp variable name in one of the bytecode handlers.

At the moment of building the VM, I got a parse error, as register is a reserved word in C.

I think we should detect those cases, and add a prefix/suffix to those variable names so that they do not collide with C reserved words.