[PATCH 3/4][PR target/88808]Enable bitwise operator for AVX512 masks.

Hongtao Liu crazylht@gmail.com
Fri Aug 14 08:26:18 GMT 2020

1. Set cost of movement inside mask registers a bit higher than gpr's.
2. Set cost of movement between mask register and gpr much higher than movement
   inside gpr, but still less equal than load/store.
3. Set cost of mask register load/store a bit higher than gpr load/store.

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