Fix typo and place comment close to its target

[chenwj]

Summary

Should be "per se" not "per say". Also place comment about ConvergingVLIWScheduler upon the class itself.

[chenwj]

I don't have commit access, need your help. ;-)

lib/Target/Hexagon/HexagonMachineScheduler.h

 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetInstrInfo.h"
 
 using namespace llvm;
 
 namespace llvm {
-//===----------------------------------------------------------------------===//
-// ConvergingVLIWScheduler - Implementation of the standard
-// MachineSchedStrategy.
-//===----------------------------------------------------------------------===//
 
 class VLIWResourceModel {
   /// ResourcesModel - Represents VLIW state.
-  /// Not limited to VLIW targets per say, but assumes
+  /// Not limited to VLIW targets per se, but assumes
   /// definition of DFA by a target.
   DFAPacketizer *ResourcesModel;
 
   const TargetSchedModel *SchedModel;
 
   /// Local packet/bundle model. Purely
   /// internal to the MI schedulre at the time.
   std::vector<SUnit*> Packet;
VLIWMachineScheduler(MachineSchedContext *C,
                        std::unique_ptr<MachineSchedStrategy> S)
       : ScheduleDAGMILive(C, std::move(S)) {}
 
   /// Schedule - This is called back from ScheduleDAGInstrs::Run() when it's
   /// time to do some work.
   void schedule() override;
 };
 
+//===----------------------------------------------------------------------===//
+// ConvergingVLIWScheduler - Implementation of the standard
+// MachineSchedStrategy.
+//===----------------------------------------------------------------------===//
+
 /// ConvergingVLIWScheduler shrinks the unscheduled zone using heuristics
 /// to balance the schedule.
 class ConvergingVLIWScheduler : public MachineSchedStrategy {
 
   /// Store the state used by ConvergingVLIWScheduler heuristics, required
   ///  for the lifetime of one invocation of pickNode().
   struct SchedCandidate {
     // The best SUnit candidate.