Optimise equality comparisons

* In both loader and compiler, make sure constants are always the second
  operand - many passes of the compiler assume that's always the case.
* In loader rewrite is_eq_exact with same arguments to skip the instruction
  and with different constants move one to an x register to maintain
  the properly outlined above.
* The same (but in reverse) is done with the is_ne_exact, where we rewrite
  to an unconditional jump or add a move to an x register.
* All of the above allow to replace is_eq_exact_fss with is_eq_exact_fyy and
  is_ne_exact_fss with is_ne_exact_fSS as those are the only possibilities left.

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