Move Sched::Preference out of TargetMachine.h where it is not referenced.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148014 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/ScheduleDAG.h

@@ -16,7 +16,7 @@
 #define LLVM_CODEGEN_SCHEDULEDAG_H
 
 #include "llvm/CodeGen/MachineBasicBlock.h"
-#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetLowering.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/GraphTraits.h"

include/llvm/Target/TargetLowering.h

@@ -53,6 +53,15 @@ namespace llvm {
   class TargetLoweringObjectFile;
   class Value;
 
+  namespace Sched {
+    enum Preference {
+      None,             // No preference
+      RegPressure,      // Scheduling for lowest register pressure.
+      Hybrid,           // Scheduling for both latency and register pressure.
+      ILP               // Scheduling for ILP in low register pressure mode.
+    };
+  }
+
   // FIXME: should this be here?
   namespace TLSModel {
     enum Model {

include/llvm/Target/TargetMachine.h

@@ -44,15 +44,6 @@ class TargetSubtargetInfo;
 class formatted_raw_ostream;
 class raw_ostream;
 
-namespace Sched {
-  enum Preference {
-    None,             // No preference
-    RegPressure,      // Scheduling for lowest register pressure.
-    Hybrid,           // Scheduling for both latency and register pressure.
-    ILP               // Scheduling for ILP in low register pressure mode.
-  };
-}
-
 //===----------------------------------------------------------------------===//
 ///
 /// TargetMachine - Primary interface to the complete machine description for