[PM] Normalize FIXMEs for missing PreserveCFG to have the same wording.

llvm-svn: 273974
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 2d3ff83..c25199d 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -3111,7 +3111,7 @@
     return PreservedAnalyses::all();
 
   // Mark all the analyses that instcombine updates as preserved.
-  // FIXME: Need a way to preserve CFG analyses here!
+  // FIXME: This should also 'preserve the CFG'.
   PreservedAnalyses PA;
   PA.preserve<DominatorTreeAnalysis>();
   return PA;