[DFAPacketizer] Move DefaultVLIWScheduler class declaration to header file

This change moves "DefaultVLIWScheduler" class declaration from
DFAPacketizer.cpp to DFAPacketizer.h.
This is needed because there is a protected class member of
type "DefaultVLIWScheduler*" in "VLIWPacketizerList" class.
The derived classes cannot use this memeber unless declaration
is available to it. More specifically :

// Without this change

```
class HexagonPacketizerList : public VLIWPacketizerList {
  public :
	HexagonPacketizerList() {
	// Below line will cause incomplete class error since
	// declaration was not available through header.
	VLIWScheduler->schedule();
  }
}
```

Reviewed By: kparzysz

Differential Revision: https://reviews.llvm.org/D139767

1 files changed, 0 insertions, 30 deletions

diff --git a/llvm/lib/CodeGen/DFAPacketizer.cpp b/llvm/lib/CodeGen/DFAPacketizer.cpp
index 34fb1d2..cf02918b9 100644
--- a/llvm/lib/CodeGen/DFAPacketizer.cpp
+++ b/llvm/lib/CodeGen/DFAPacketizer.cpp
@@ -29,8 +29,6 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrBundle.h"
 #include "llvm/CodeGen/ScheduleDAG.h"
-#include "llvm/CodeGen/ScheduleDAGInstrs.h"
-#include "llvm/CodeGen/ScheduleDAGMutation.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/MC/MCInstrDesc.h"
@@ -98,34 +96,6 @@ unsigned DFAPacketizer::getUsedResources(unsigned InstIdx) {
   return RS[InstIdx] ^ RS[InstIdx - 1];
 }
 
-namespace llvm {
-
-// This class extends ScheduleDAGInstrs and overrides the schedule method
-// to build the dependence graph.
-class DefaultVLIWScheduler : public ScheduleDAGInstrs {
-private:
-  AAResults *AA;
-  /// Ordered list of DAG postprocessing steps.
-  std::vector<std::unique_ptr<ScheduleDAGMutation>> Mutations;
-
-public:
-  DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI,
-                       AAResults *AA);
-
-  // Actual scheduling work.
-  void schedule() override;
-
-  /// DefaultVLIWScheduler takes ownership of the Mutation object.
-  void addMutation(std::unique_ptr<ScheduleDAGMutation> Mutation) {
-    Mutations.push_back(std::move(Mutation));
-  }
-
-protected:
-  void postprocessDAG();
-};
-
-} // end namespace llvm
-
 DefaultVLIWScheduler::DefaultVLIWScheduler(MachineFunction &MF,
                                            MachineLoopInfo &MLI,
                                            AAResults *AA)