Comment parsing: close a hole in CDATA escaping in XML output


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206886 91177308-0d34-0410-b5e6-96231b3b80d8
ARM64: update NEON test to improved backend codegen

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@206890 91177308-0d34-0410-b5e6-96231b3b80d8