Reverting r181004 since it has broken test/Sema/wchar.c.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181122 91177308-0d34-0410-b5e6-96231b3b80d8
Properly parsing __declspec(safebuffers), though there is no semantic hookup.  For more information about safebuffers, see MSDN: http://msdn.microsoft.com/en-us/library/dd778695(v=vs.110).aspx

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181123 91177308-0d34-0410-b5e6-96231b3b80d8