Change cxx0x to cxx11 in diagnostic name.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@186285 91177308-0d34-0410-b5e6-96231b3b80d8
Change cxx0x to cxx11 in diagnostic name.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@186286 91177308-0d34-0410-b5e6-96231b3b80d8
Replace C++0x in a comment with C++11

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@186287 91177308-0d34-0410-b5e6-96231b3b80d8