Thread DataLayout through the callers and into mem2reg. This will be

useful in a subsequent patch, but causes an unfortunate amount of noise,
so I pulled it out into a separate patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187322 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/PromoteMemToReg.h

@@ -20,6 +20,7 @@
 namespace llvm {
 
 class AllocaInst;
+class DataLayout;
 class DominatorTree;
 class AliasSetTracker;
 
@@ -29,7 +30,7 @@ class AliasSetTracker;
 /// (transitively) using this alloca. This also enforces that there is only
 /// ever one layer of bitcasts or GEPs between the alloca and the lifetime
 /// markers.
-bool isAllocaPromotable(const AllocaInst *AI);
+bool isAllocaPromotable(const AllocaInst *AI, const DataLayout *DL);
 
 /// \brief Promote the specified list of alloca instructions into scalar
 /// registers, inserting PHI nodes as appropriate.
@@ -41,7 +42,7 @@ bool isAllocaPromotable(const AllocaInst *AI);
 /// If AST is specified, the specified tracker is updated to reflect changes
 /// made to the IR.
 void PromoteMemToReg(ArrayRef<AllocaInst *> Allocas, DominatorTree &DT,
-                     AliasSetTracker *AST = 0);
+                     const DataLayout *DL, AliasSetTracker *AST = 0);
 
 } // End llvm namespace