[MBP] Fix a really misleading typo in a comment.

llvm-svn: 235006
diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index ecc50c9..5e7daa8 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -661,7 +661,7 @@
   for (MachineBasicBlock *MBB : L.getBlocks()) {
     BlockChain &Chain = *BlockToChain[MBB];
     // Ensure that this block is at the end of a chain; otherwise it could be
-    // mid-way through an inner loop or a successor of an analyzable branch.
+    // mid-way through an inner loop or a successor of an unanalyzable branch.
     if (MBB != *std::prev(Chain.end()))
       continue;