Constrain the type of a parameter now that callers without this constraint have been removed.

llvm-svn: 233419
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index fb2321d..8136902 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -316,7 +316,7 @@
   bool ShouldChangeType(Type *From, Type *To) const;
   Value *dyn_castNegVal(Value *V) const;
   Value *dyn_castFNegVal(Value *V, bool NoSignedZero = false) const;
-  Type *FindElementAtOffset(Type *PtrTy, int64_t Offset,
+  Type *FindElementAtOffset(PointerType *PtrTy, int64_t Offset,
                             SmallVectorImpl<Value *> &NewIndices);
   Instruction *FoldOpIntoSelect(Instruction &Op, SelectInst *SI);