Make helpers static & 80 cols.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178767 91177308-0d34-0410-b5e6-96231b3b80d8
Use isExternalLinkage instead of hasExternalLinkage.

Having these not be the same makes an easy to misuse API. We should audit the
uses and probably rename to something like

foo->hasExternalLinkage():
  The c++ standard one. That is UniqueExternalLinkage or ExternalLinkage.

foo->hasUniqueExternalLinkage():
  Is UniqueExternalLinkage.

foo->hasCogeGenExternalLinkage():
  Is ExternalLinkage.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178768 91177308-0d34-0410-b5e6-96231b3b80d8
Add test case to show that 'availability' and 'deprecated' do *not* inherit when redeclaring ObjC properties.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178770 91177308-0d34-0410-b5e6-96231b3b80d8