Make some DataLayout pointers const.

No functionality change. Just reduces the noise of an upcoming patch.

llvm-svn: 202087
diff --git a/llvm/lib/Transforms/Scalar/LICM.cpp b/llvm/lib/Transforms/Scalar/LICM.cpp
index 2ba6210..4a3fe42 100644
--- a/llvm/lib/Transforms/Scalar/LICM.cpp
+++ b/llvm/lib/Transforms/Scalar/LICM.cpp
@@ -108,7 +108,7 @@
     LoopInfo      *LI;       // Current LoopInfo
     DominatorTree *DT;       // Dominator Tree for the current Loop.
 
-    DataLayout *DL;          // DataLayout for constant folding.
+    const DataLayout *DL;    // DataLayout for constant folding.
     TargetLibraryInfo *TLI;  // TargetLibraryInfo for constant folding.
 
     // State that is updated as we process loops.