Retire llvm::alignOf in favor of C++11 alignof.

No functionality change intended.

llvm-svn: 284730
diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
index 97f75a0..5ca5d85 100644
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -1797,7 +1797,7 @@
                                                VarDecl **Indices,
                                                unsigned NumIndices) {
   void *Mem = Context.Allocate(totalSizeToAlloc<VarDecl *>(NumIndices),
-                               llvm::alignOf<CXXCtorInitializer>());
+                               alignof(CXXCtorInitializer));
   return new (Mem) CXXCtorInitializer(Context, Member, MemberLoc, L, Init, R,
                                       Indices, NumIndices);
 }