[Alignment][Clang][NFC] Add CharUnits::getAsAlign

Summary:
This is a prerequisite to removing `llvm::GlobalObject::setAlignment(unsigned)`.
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: jholewinski, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68274

llvm-svn: 373592
diff --git a/clang/lib/CodeGen/CGExprCXX.cpp b/clang/lib/CodeGen/CGExprCXX.cpp
index d7b1d9b..49527e9 100644
--- a/clang/lib/CodeGen/CGExprCXX.cpp
+++ b/clang/lib/CodeGen/CGExprCXX.cpp
@@ -532,7 +532,7 @@
 
     CharUnits Align = std::max(Layout.getNonVirtualAlignment(),
                                DestPtr.getAlignment());
-    NullVariable->setAlignment(Align.getQuantity());
+    NullVariable->setAlignment(Align.getAsAlign());
 
     Address SrcPtr = Address(CGF.EmitCastToVoidPtr(NullVariable), Align);