go spec: line comments may end in EOF
go spec: line comments may end in EOF

Consistency argument: A valid Go program should
remain valid after stripping leading and trailing
whitespace. This was not true so far if the last
text in the source was a line comment.

R=iant, ken2, r, rsc, r2
CC=golang-dev
http://codereview.appspot.com/2906041

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