Updated the support for contextual conversion tweaks (n3323) with a previously overlooked part: implicitly converting array sizes to size_t, rather than contextually converting them to some unique type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184048 91177308-0d34-0410-b5e6-96231b3b80d8
Updated status of support for contextual conversion from partial to full

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184049 91177308-0d34-0410-b5e6-96231b3b80d8