Fix this comment. The loop header is the loop entry point.

llvm-svn: 83437
diff --git a/llvm/lib/CodeGen/CodePlacementOpt.cpp b/llvm/lib/CodeGen/CodePlacementOpt.cpp
index 383098e..932fae4 100644
--- a/llvm/lib/CodeGen/CodePlacementOpt.cpp
+++ b/llvm/lib/CodeGen/CodePlacementOpt.cpp
@@ -95,11 +95,11 @@
 ///       ...
 ///       jmp B
 ///
-///       C:  --> new loop header
+///       C:
 ///       ...
 ///       <fallthough to B>
 ///       
-///       B:
+///       B:  --> loop header
 ///       ...
 ///       jcc <cond> C, [exit]
 ///