Simplify the tracking of when to issue a fixit hint, making the helper
function more clear and obvious in behavior.

Add some comments documenting the behavior of the primary diagnostic helper.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128901 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed