[clang-format] Don't insert space between ObjC class and lightweight generic

Summary:
In D45185, I added clang-format parser support for Objective-C
generics. However, I didn't touch the whitespace logic, so they
got the same space logic as Objective-C protocol lists.

In every example in the Apple SDK and in the documentation,
there is no space between the class name and the opening `<`
for the lightweight generic specification, so this diff
removes the space and updates the tests.

Test Plan: Tests updated. Ran tests with:
  % make -j16 FormatTests && ./tools/clang/unittests/Format/FormatTests

Reviewers: djasper, jolesiak

Reviewed By: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D45498

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@329917 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/TokenAnnotator.cpp

@@ -2349,9 +2349,12 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
                : Style.SpacesInParentheses;
   if (Right.isOneOf(tok::semi, tok::comma))
     return false;
-  if (Right.is(tok::less) && Line.Type == LT_ObjCDecl &&
-      Style.ObjCSpaceBeforeProtocolList)
-    return true;
+  if (Right.is(tok::less) && Line.Type == LT_ObjCDecl) {
+    bool IsLightweightGeneric =
+        Right.MatchingParen && Right.MatchingParen->Next &&
+        Right.MatchingParen->Next->is(tok::colon);
+    return !IsLightweightGeneric && Style.ObjCSpaceBeforeProtocolList;
+  }
   if (Right.is(tok::less) && Left.is(tok::kw_template))
     return Style.SpaceAfterTemplateKeyword;
   if (Left.isOneOf(tok::exclaim, tok::tilde))

unittests/Format/FormatTestObjC.cpp

@@ -299,13 +299,13 @@ TEST_F(FormatTestObjC, FormatObjCInterface) {
                "+ (id)init;\n"
                "@end");
 
-  verifyFormat("@interface Foo <Baz : Blech> : Bar <Baz, Quux> {\n"
+  verifyFormat("@interface Foo<Baz : Blech> : Bar <Baz, Quux> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"
                "@end");
 
-  verifyFormat("@interface Foo <Bar : Baz <Blech>> : Xyzzy <Corge> {\n"
+  verifyFormat("@interface Foo<Bar : Baz <Blech>> : Xyzzy <Corge> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"