A quick nm audit turned up several fixed tables and objects that were
marked read-write. Use const so that they can be allocated in a
read-only segment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48800 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index 94d3a6d..048ee2c 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -221,8 +221,8 @@
     if (SU->Node->isTargetOpcode()) {
       unsigned SchedClass =
         TII->get(SU->Node->getTargetOpcode()).getSchedClass();
-      InstrStage *S = InstrItins.begin(SchedClass);
-      InstrStage *E = InstrItins.end(SchedClass);
+      const InstrStage *S = InstrItins.begin(SchedClass);
+      const InstrStage *E = InstrItins.end(SchedClass);
       for (; S != E; ++S)
         SU->Latency += S->Cycles;
     }
@@ -230,8 +230,8 @@
       SDNode *FNode = SU->FlaggedNodes[i];
       if (FNode->isTargetOpcode()) {
         unsigned SchedClass =TII->get(FNode->getTargetOpcode()).getSchedClass();
-        InstrStage *S = InstrItins.begin(SchedClass);
-        InstrStage *E = InstrItins.end(SchedClass);
+        const InstrStage *S = InstrItins.begin(SchedClass);
+        const InstrStage *E = InstrItins.end(SchedClass);
         for (; S != E; ++S)
           SU->Latency += S->Cycles;
       }