[Alignment][NFC] CreateMemSet use MaybeAlign

Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: arsenm, jvesely, nhaehnle, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D71213
diff --git a/clang/lib/CodeGen/CGBuilder.h b/clang/lib/CodeGen/CGBuilder.h
index dae3fbb..746053f 100644
--- a/clang/lib/CodeGen/CGBuilder.h
+++ b/clang/lib/CodeGen/CGBuilder.h
@@ -296,7 +296,7 @@
   llvm::CallInst *CreateMemSet(Address Dest, llvm::Value *Value,
                                llvm::Value *Size, bool IsVolatile = false) {
     return CreateMemSet(Dest.getPointer(), Value, Size,
-                        Dest.getAlignment().getQuantity(), IsVolatile);
+                        Dest.getAlignment().getAsAlign(), IsVolatile);
   }
 
   using CGBuilderBaseTy::CreatePreserveStructAccessIndex;