Make some DataLayout pointers const.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202087 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Instrumentation/AddressSanitizer.cpp

@@ -334,7 +334,7 @@ struct AddressSanitizer : public FunctionPass {
   SmallString<64> BlacklistFile;
 
   LLVMContext *C;
-  DataLayout *DL;
+  const DataLayout *DL;
   int LongSize;
   Type *IntptrTy;
   ShadowMapping Mapping;
@@ -383,7 +383,7 @@ class AddressSanitizerModule : public ModulePass {
   SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals;
   Type *IntptrTy;
   LLVMContext *C;
-  DataLayout *DL;
+  const DataLayout *DL;
   ShadowMapping Mapping;
   Function *AsanPoisonGlobals;
   Function *AsanUnpoisonGlobals;

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

@@ -164,7 +164,7 @@ class DataFlowSanitizer : public ModulePass {
     WK_Custom
   };
 
-  DataLayout *DL;
+  const DataLayout *DL;
   Module *Mod;
   LLVMContext *Ctx;
   IntegerType *ShadowTy;

lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -222,7 +222,7 @@ class MemorySanitizer : public FunctionPass {
   /// \brief Track origins (allocation points) of uninitialized values.
   bool TrackOrigins;
 
-  DataLayout *DL;
+  const DataLayout *DL;
   LLVMContext *C;
   Type *IntptrTy;
   Type *OriginTy;

lib/Transforms/Instrumentation/ThreadSanitizer.cpp

@@ -96,7 +96,7 @@ struct ThreadSanitizer : public FunctionPass {
   bool addrPointsToConstantData(Value *Addr);
   int getMemoryAccessFuncIndex(Value *Addr);
 
-  DataLayout *DL;
+  const DataLayout *DL;
   Type *IntptrTy;
   SmallString<64> BlacklistFile;
   OwningPtr<SpecialCaseList> BL;