[NFC] Change MemIntrinsicInst::setAlignment() to take an unsigned instead of a Constant

Summary:
 In preparation for https://reviews.llvm.org/D41675 this NFC changes this
prototype of MemIntrinsicInst::setAlignment() to accept an unsigned instead
of a Constant.

llvm-svn: 322403
diff --git a/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
index 09bcbb2..5f6fa65 100644
--- a/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
@@ -1385,10 +1385,10 @@
   Value *AlignShadow;
   if (ClPreserveAlignment) {
     AlignShadow = IRB.CreateMul(I.getAlignmentCst(),
-                                ConstantInt::get(I.getAlignmentCst()->getType(),
+                                ConstantInt::get(I.getAlignmentType(),
                                                  DFSF.DFS.ShadowWidth / 8));
   } else {
-    AlignShadow = ConstantInt::get(I.getAlignmentCst()->getType(),
+    AlignShadow = ConstantInt::get(I.getAlignmentType(),
                                    DFSF.DFS.ShadowWidth / 8);
   }
   Type *Int8Ptr = Type::getInt8PtrTy(*DFSF.DFS.Ctx);