[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/CGObjCGNU.cpp b/clang/lib/CodeGen/CGObjCGNU.cpp
index ee0fd18..c21f257 100644
--- a/clang/lib/CodeGen/CGObjCGNU.cpp
+++ b/clang/lib/CodeGen/CGObjCGNU.cpp
@@ -1294,7 +1294,7 @@
       // Emit a placeholder symbol.
       GV = new llvm::GlobalVariable(TheModule, ProtocolTy, false,
           llvm::GlobalValue::ExternalLinkage, nullptr, Name);
-      GV->setAlignment(CGM.getPointerAlign().getQuantity());
+      GV->setAlignment(CGM.getPointerAlign().getAsAlign());
     }
     return llvm::ConstantExpr::getBitCast(GV, ProtocolPtrTy);
   }
@@ -1318,7 +1318,7 @@
           llvm::ConstantExpr::getBitCast(Protocol, ProtocolPtrTy), RefName);
       GV->setComdat(TheModule.getOrInsertComdat(RefName));
       GV->setSection(sectionName<ProtocolReferenceSection>());
-      GV->setAlignment(CGM.getPointerAlign().getQuantity());
+      GV->setAlignment(CGM.getPointerAlign().getAsAlign());
       Ref = GV;
     }
     EmittedProtocolRef = true;
@@ -1497,7 +1497,7 @@
         Sym->setSection((Section + SecSuffix).str());
         Sym->setComdat(TheModule.getOrInsertComdat((Prefix +
             Section).str()));
-        Sym->setAlignment(CGM.getPointerAlign().getQuantity());
+        Sym->setAlignment(CGM.getPointerAlign().getAsAlign());
         return Sym;
       };
       return { Sym("__start_", "$a"), Sym("__stop", "$z") };
@@ -4087,7 +4087,7 @@
       auto GV = new llvm::GlobalVariable(TheModule, IntTy,
           false, llvm::GlobalValue::LinkOnceAnyLinkage,
           llvm::Constant::getNullValue(IntTy), name);
-      GV->setAlignment(Align.getQuantity());
+      GV->setAlignment(Align.getAsAlign());
       Offset = GV;
     }
     Offset = CGF.Builder.CreateAlignedLoad(Offset, Align);