AVX-512: changed property name from "neverHasSideEffects=1" to "hasSideEffects=0", added this property to VMOVSS/VMOVSD;
Optimized a truncate pattern.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198562 91177308-0d34-0410-b5e6-96231b3b80d8