Add -Wdeprecated warnings and fixits for things deprecated in C++11:
 - 'register' storage class
 - dynamic exception specifications

Only the former check is enabled by default for now (the latter might be quite noisy).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183881 91177308-0d34-0410-b5e6-96231b3b80d8
In C++11, promote access declaration diagnostic from warning to error. There
doesn't seem to be any value in even adding a -W flag for this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183882 91177308-0d34-0410-b5e6-96231b3b80d8
Implement core issue 903: only integer literals with value 0 and prvalues of
type std::nullptr_t are null pointer constants from C++11 onwards.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183883 91177308-0d34-0410-b5e6-96231b3b80d8