Add SplitEditor to SplitKit. This class will be used to edit live intervals and
rewrite instructions for live range splitting.

Still work in progress.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109469 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 1016c0a..d8616fd 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -110,8 +110,8 @@
   splitAnalysis_.analyze(li_);
 
   if (const MachineLoop *loop = splitAnalysis_.getBestSplitLoop()) {
-    if (splitAroundLoop(splitAnalysis_, loop))
-      return true;
+    SplitEditor(splitAnalysis_, lis_, vrm_).splitAroundLoop(loop);
+    return true;
   }
   return false;
 }