Use create methods since msvc doesn't handle delegating constructors.

llvm-svn: 209076
diff --git a/llvm/lib/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index dc3d6f3..27ce503 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -1489,9 +1489,9 @@
 LLVMValueRef LLVMAddAlias(LLVMModuleRef M, LLVMTypeRef Ty, LLVMValueRef Aliasee,
                           const char *Name) {
   auto *PTy = cast<PointerType>(unwrap(Ty));
-  return wrap(new GlobalAlias(PTy->getElementType(), PTy->getAddressSpace(),
-                              GlobalValue::ExternalLinkage, Name,
-                              unwrap<GlobalObject>(Aliasee), unwrap(M)));
+  return wrap(GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
+                                  GlobalValue::ExternalLinkage, Name,
+                                  unwrap<GlobalObject>(Aliasee), unwrap(M)));
 }
 
 /*--.. Operations on functions .............................................--*/