Change the Spiller interface to take a LiveRangeEdit reference.

This makes it possible to register delegates and get callbacks when the spiller
edits live ranges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 4f1b811..86fd108 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -1253,7 +1253,8 @@
 
   // Finally spill VirtReg itself.
   NamedRegionTimer T("Spiller", TimerGroupName, TimePassesIsEnabled);
-  spiller().spill(&VirtReg, NewVRegs, 0);
+  LiveRangeEdit LRE(VirtReg, NewVRegs, this);
+  spiller().spill(LRE);
 
   // The live virtual register requesting allocation was spilled, so tell
   // the caller not to allocate anything during this round.