Add a class ObjCProtocolQualifiers to wrap APIs for ObjC protocol list.

Now ObjCObjectType extends from ObjCProtocolQualifiers. We save number of
protocols in ObjCProtocolQualifiers.

This is in preparation of adding a new type class ObjCTypeParamType that
can take protocol qualifiers.

rdar://24619481
rdar://25060179

Differential Revision: http://reviews.llvm.org/D23078


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281351 91177308-0d34-0410-b5e6-96231b3b80d8