LivePhysRegs: Follow-up to r303937

We may have situations in which a superregister is reserved and not
added to liveins, so we have to add the subregisters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303949 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed