MIR: remove explicit "noVRegs" property.

We can infer this from the incoming MIR, so there's no reason to
represent it with a special flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304246 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed