Add LiveIntervals::addKillFlags() to recompute kill flags after register allocation.

This is a lot easier than trying to get kill flags right during live range
splitting and rematerialization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125113 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveIntervalAnalysis.h

@@ -320,6 +320,10 @@ namespace llvm {
     MachineBasicBlock::iterator getLastSplitPoint(const LiveInterval &li,
                                                   MachineBasicBlock *mbb);
 
+    /// addKillFlags - Add kill flags to any instruction that kills a virtual
+    /// register.
+    void addKillFlags();
+
   private:
     /// computeIntervals - Compute live intervals.
     void computeIntervals();