fix excessive whitespace trimming resulting in innaccurate sourcemap line - fixes #151

test/fixtures/generation/comments/simple-a-lot-of-line-comment/expected.js

@@ -20,8 +20,11 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+
 function test() {}
 
+
+
 // Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
 //
 // Redistribution and use in source and binary forms, with or without