Add option to put short loops on a single line.

This enables things like:

for (int &v : vec) v *= 2;

Enabled for Google style.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182000 91177308-0d34-0410-b5e6-96231b3b80d8
Add config parsing test for new parameter.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182001 91177308-0d34-0410-b5e6-96231b3b80d8
Don't insert a break into include lines with trailing comments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182003 91177308-0d34-0410-b5e6-96231b3b80d8