[ruby/yarp] Match EOF after newline behavior

in Ripper EOL after whitespace is returned as a on_nl node with the whitespace as the content

k0kubun: This is a resync of 9aca3528aa1a1545468a508b02b77bc922bb7321.
git.ruby-lang.org had an old git version and the diff was wrong.
It now has a newer git, so this should succeed next time.

https://github.com/ruby/yarp/commit/be16d1deed

test/yarp/fixtures/indented_file_end.txt

@@ -0,0 +1,4 @@
+    def hi
+    
+    end # hi there
+