Add support for JIT-ing of spl_object_id() and ord() calls

[TysonAndre]

See Optimizing assembly for spl_object_id(), fdiv(), etc in the JIT?

Having an example for a few functions would be useful to build off of.

This PR is only supporting IS_CV (named PHP variables),
because garbage collection and exception handling are unnecessary.
This is also only supporting operands known to have the exact expected type.

I'm only proposing this optimization for the JIT.
Adding too many specialized opcodes to the regular PHP VM might harm performance
by making the VM too large, and would make writing optimizations harder.

Future scope:

• There are a lot of simple functions in ext/standard/math.c
  such as fdiv(), sin(), cos(), tan(), abs(), etc.
• Additionally, there's more complicated but frequently functions such as in_array(),
  strpos, get_class() etc. that may be useful to call directly to avoid the overhead of
  function calls and exception handling, when safe to do so
  (e.g. no notices or exceptions).

[dstogov]

Sorry, I missed this PR.
It looks outdated and I'm closing it now.
If the idea is still relevant it should be applied to master with new IR based JIT.