[RDF] Add registers to live set even if they are live already

When calculating kills, a register may be considered live because a part
of it is live, but if there is a use of that (whole) register, the whole
register (and its subregisters) need to be added to the live set.

llvm-svn: 292845

llvm/lib/Target/Hexagon/RDFLiveness.cpp

@@ -803,8 +803,7 @@ void Liveness::resetKills(MachineBasicBlock *B) {
         IsLive = true;
         break;
       }
-      if (IsLive)
-        continue;
+      if (!IsLive)
         Op.setIsKill(true);
       for (MCSubRegIterator SR(R, &TRI, true); SR.isValid(); ++SR)
         Live.set(*SR);