Adds support for formatting NS_CLOSED_ENUM and CF_CLOSED_ENUM alongside NS_ENUM and CF_ENUM.

Summary:
Addresses the formatting of NS_CLOSED_ENUM and CF_CLOSED_ENUM, introduced in Swift 5.

Before:

```
typedef NS_CLOSED_ENUM(NSInteger, Foo){FooValueOne = 1, FooValueTwo,
                                       FooValueThree};
```

After:

```
typedef NS_CLOSED_ENUM(NSInteger, Foo) {
  FooValueOne = 1,
  FooValueTwo,
  FooValueThree
};
```

Contributed by heijink.

Reviewers: benhamilton, krasimir

Reviewed By: benhamilton

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65012

llvm-svn: 366719
diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index a35e98a..b9da698 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1215,7 +1215,8 @@
     case tok::kw_typedef:
       nextToken();
       if (FormatTok->isOneOf(Keywords.kw_NS_ENUM, Keywords.kw_NS_OPTIONS,
-                             Keywords.kw_CF_ENUM, Keywords.kw_CF_OPTIONS))
+                             Keywords.kw_CF_ENUM, Keywords.kw_CF_OPTIONS,
+                             Keywords.kw_CF_CLOSED_ENUM, Keywords.kw_NS_CLOSED_ENUM))
         parseEnum();
       break;
     case tok::kw_struct: