MCInstrDesc: Flags (uint64_t) was checked using (1 << MCID::XYZ), but this

MCInstrDesc: Flags (uint64_t) was checked using (1 << MCID::XYZ), but this
should have been (1ULL << MCID::XYZ). Currently this works because enum Flag
has 31 values, but extending it will result in a compile warnings/errors.
This was part of the accepted patch in https://reviews.llvm.org/D23601, but
it was suggested to apply this first as a separate patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281149 91177308-0d34-0410-b5e6-96231b3b80d8