[clang-format] Add more tests for ObjC protocol list formatting behavior

[benhamilton]

Summary

The existing unit tests in FormatTestObjC.cpp didn't fully cover
all the cases for protocol confirmance list formatting.

This extends the unit tests to more cases of protocol
conformance list formatting, especially how the behavior changes
when BinPackParameters changes from true (the default) to false.

Test Plan: make -j12 FormatTests && \

./tools/clang/unittests/Format/FormatTests --gtest_filter=FormatTestObjC.\*

unittests/Format/FormatTestObjC.cpp

verifyFormat("@interface Foo () {\n"
                "@end");
 
   verifyFormat("@interface Foo (HackStuff) <MyProtocol> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"
                "@end");
 
+  Style.ColumnLimit = 40;
+  verifyFormat("@interface ccccccccccccc () <\n"
+               "    ccccccccccccc, ccccccccccccc,\n"
+               "    ccccccccccccc, ccccccccccccc> {\n"
+               "}");
+
+  Style.BinPackParameters = false;
+  verifyFormat("@interface ddddddddddddd () <\n"
+               "    ddddddddddddd,\n"
+               "    ddddddddddddd,\n"
+               "    ddddddddddddd,\n"
+               "    ddddddddddddd> {\n"
+               "}");
+
   Style = getGoogleStyle(FormatStyle::LK_ObjC);
   verifyFormat("@interface Foo : NSObject <NSSomeDelegate> {\n"
                " @public\n"
                "  int field1;\n"
                " @protected\n"
                "  int field2;\n"
                " @private\n"
                "  int field3;\n"