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/Format.cpp b/clang/lib/Format/Format.cpp
index c481829..62e8fdc 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1685,10 +1685,11 @@
                                 std::end(FoundationIdentifiers),
                                 FormatTok->TokenText)) ||
             FormatTok->is(TT_ObjCStringLiteral) ||
-            FormatTok->isOneOf(Keywords.kw_NS_ENUM, Keywords.kw_NS_OPTIONS,
-                               TT_ObjCBlockLBrace, TT_ObjCBlockLParen,
-                               TT_ObjCDecl, TT_ObjCForIn, TT_ObjCMethodExpr,
-                               TT_ObjCMethodSpecifier, TT_ObjCProperty)) {
+            FormatTok->isOneOf(Keywords.kw_NS_CLOSED_ENUM, Keywords.kw_NS_ENUM,
+                               Keywords.kw_NS_OPTIONS, TT_ObjCBlockLBrace,
+                               TT_ObjCBlockLParen, TT_ObjCDecl, TT_ObjCForIn,
+                               TT_ObjCMethodExpr, TT_ObjCMethodSpecifier,
+                               TT_ObjCProperty)) {
           LLVM_DEBUG(llvm::dbgs()
                      << "Detected ObjC at location "
                      << FormatTok->Tok.getLocation().printToString(