Fix typos found by http://github.com/lyda/misspell-check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index dbf959b..d0fde6f 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -340,7 +340,7 @@
   void clear();
 
   /// clearDanglingDebugInfo - Clear the dangling debug information
-  /// map. This function is seperated from the clear so that debug
+  /// map. This function is separated from the clear so that debug
   /// information that is dangling in a basic block can be properly
   /// resolved in a different basic block. This allows the
   /// SelectionDAG to resolve dangling debug information attached