[clang-format] Support lightweight Objective-C generics


[clang-format] Support lightweight Objective-C generics

Previously, clang-format didn't understand lightweight
Objective-C generics, which have the form:

@interface Foo <KeyType,
                ValueTypeWithConstraint : Foo,
		AnotherValueTypeWithGenericConstraint: Bar<Baz>, ... > ...

The lightweight generic specifier list appears before the base
class, if present, but because it starts with < like the protocol
specifier list, UnwrappedLineParser was getting confused and
failed to parse interfaces with both generics and protocol lists:

@interface Foo <KeyType> : NSObject <NSCopying>

Since the parsed line would be incomplete, the format result
would be very confused (e.g., https://bugs.llvm.org/show_bug.cgi?id=24381).

This fixes the issue by explicitly parsing the ObjC lightweight
generic conformance list, so the line is fully parsed.

Fixes: https://bugs.llvm.org/show_bug.cgi?id=24381

Test Plan: New tests added. 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/D45185