fix trivial typos; NFC

sucessor -> successor 

llvm-svn: 307488
diff --git a/llvm/lib/Analysis/LoopInfo.cpp b/llvm/lib/Analysis/LoopInfo.cpp
index c711360..baf9324 100644
--- a/llvm/lib/Analysis/LoopInfo.cpp
+++ b/llvm/lib/Analysis/LoopInfo.cpp
@@ -460,7 +460,7 @@
 void UnloopUpdater::updateBlockParents() {
   if (Unloop.getNumBlocks()) {
     // Perform a post order CFG traversal of all blocks within this loop,
-    // propagating the nearest loop from sucessors to predecessors.
+    // propagating the nearest loop from successors to predecessors.
     LoopBlocksTraversal Traversal(DFS, LI);
     for (BasicBlock *POI : Traversal) {