Update the block cloner which fixes bugpoint on code using unwind_to (phew!)

and also update the cloning interface's major user, the loop optimizations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48088 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/LoopInfo.h

@@ -118,8 +118,8 @@ public:
   block_iterator block_begin() const { return Blocks.begin(); }
   block_iterator block_end() const { return Blocks.end(); }
 
-  /// isLoopExit - True if terminator in the block can branch to another block
-  /// that is outside of the current loop.
+  /// isLoopExit - True if this block can branch to another block that is
+  /// outside of the current loop.
   ///
   bool isLoopExit(const BlockT *BB) const {
     typedef GraphTraits<BlockT*> BlockTraits;