[analyzer;alternate arrows] adapt 'for' loop aesthetic cleanup to 'while' loops.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181504 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer; alternate arrows] for "loop back" edges add back the extra edge to the closing '}'

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181505 91177308-0d34-0410-b5e6-96231b3b80d8