1. Move all pattern fragments for SIMD instructions to X86InstrFragmentsSIMD.td
2. Create X86InstrFragments.td and move non-SIMD pattern fragments into it
3. Create X86InstrOperands.td and move operand definitions into it
4. Create X86InstrPredicates.td and move predicate definitions into it
5. Create X86InstrUtils.td and move utilities for simplifying the instruction definitions into it
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