Add a "moveInstr" method to LiveIntervals. This can be used to move instructions

around within a basic block while maintaining live-intervals.

Updated ScheduleTopDownLive in MachineScheduler.cpp to use the moveInstr API
when reordering MIs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149147 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveIntervalAnalysis.h

@@ -273,6 +273,11 @@ namespace llvm {
     /// register.
     void addKillFlags();
 
+    /// moveInstr - Move MachineInstr mi to insertPt, updating the live
+    /// intervals of mi's operands to reflect the new position. The insertion
+    /// point can be above or below mi, but must be in the same basic block.
+    void moveInstr(MachineBasicBlock::iterator insertPt, MachineInstr* mi);
+
   private:
     /// computeIntervals - Compute live intervals.
     void computeIntervals();