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/InstCombine/InstCombine.h b/llvm/lib/Transforms/InstCombine/InstCombine.h
index 241db7a..2a4b8a1 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombine.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombine.h
@@ -81,7 +81,7 @@
 class LLVM_LIBRARY_VISIBILITY InstCombiner
                              : public FunctionPass,
                                public InstVisitor<InstCombiner, Instruction*> {
-  DataLayout *DL;
+  const DataLayout *DL;
   TargetLibraryInfo *TLI;
   bool MadeIRChange;
   LibCallSimplifier *Simplifier;
@@ -108,7 +108,7 @@
 
   virtual void getAnalysisUsage(AnalysisUsage &AU) const;
 
-  DataLayout *getDataLayout() const { return DL; }
+  const DataLayout *getDataLayout() const { return DL; }
 
   TargetLibraryInfo *getTargetLibraryInfo() const { return TLI; }
 
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
index 5c1d1b1..063ab17 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -235,7 +235,7 @@
   const CastInst *CI, ///< The first cast instruction
   unsigned opcode,       ///< The opcode of the second cast instruction
   Type *DstTy,     ///< The target type for the second cast instruction
-  DataLayout *DL         ///< The target data for pointer size
+  const DataLayout *DL ///< The target data for pointer size
 ) {
 
   Type *SrcTy = CI->getOperand(0)->getType();   // A from above
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 4ad58c4..dcd2957 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -503,7 +503,7 @@
 /// If we can't emit an optimized form for this expression, this returns null.
 ///
 static Value *EvaluateGEPOffsetExpression(User *GEP, InstCombiner &IC) {
-  DataLayout &DL = *IC.getDataLayout();
+  const DataLayout &DL = *IC.getDataLayout();
   gep_type_iterator GTI = gep_type_begin(GEP);
 
   // Check to see if this gep only has a single variable index.  If so, and if