Add a LiveRangeEdit::Delegate protocol.

This will we used for keeping register allocator data structures up to date
while LiveRangeEdit is trimming live intervals.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127300 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 34ae3ec..ec15050 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -333,7 +333,7 @@
 void InlineSpiller::spill(LiveInterval *li,
                           SmallVectorImpl<LiveInterval*> &newIntervals,
                           const SmallVectorImpl<LiveInterval*> &spillIs) {
-  LiveRangeEdit edit(*li, newIntervals, &spillIs);
+  LiveRangeEdit edit(*li, newIntervals, 0, &spillIs);
   spill(edit);
   if (VerifySpills)
     mf_.verify(&pass_, "After inline spill");