Align RHS after assignments and return statements.

This changes:
  int Result = a +  // force break
      b;
  return Result +  // force break
      5;

To:
  int Result = a +  // force break
               b;
  return Result +  // force break
         5;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171032 91177308-0d34-0410-b5e6-96231b3b80d8