piece of the declaration.  The '@' and the 'end' are separate tokens,
and require two SourceLocations to accurately track.

This change was motivated because ObjCContainerDecl::getSourceRange()
would previously not return the entire range of the declaration (the
'end' would be left off).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92891 91177308-0d34-0410-b5e6-96231b3b80d8