PPCTables: Retire FL_EVIL

FL_EVIL is only used for blocking instructions from being reordered.
There are three types of instructions which have FL_EVIL set:

1. CR operations. The previous commits improved our CR analysis
   and removed FL_EVIL from these instructions.
2. Load/store operations. These are always blocked from reordering
   due to always having canCauseException set.
3. isync. I don't know if we actually need to prevent reordering
   around this one, since as far as I know we only do reorderings
   that are guaranteed to not change the behavior of the program.
   But just in case, I've renamed FL_EVIL to FL_NO_REORDER instead of
   removing it entirely, so that it can be used for this instruction.

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