Add an idea for cpp11-migrate and cpp14-migrate


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180266 91177308-0d34-0410-b5e6-96231b3b80d8
Fix header comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180268 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a possible null pointer dereference found by the analyzer.

When computing the other parameters, ‘op’ is checked for being null before it’s dereferenced.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180271 91177308-0d34-0410-b5e6-96231b3b80d8