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I don't think so - I did some trivial searches (the book, the car, and others) and Google seems to include them. However, pages with higher PR rank higher even if they don't include stop words (obviously).
Each page had a match for "no longer", not just "no" and "longer".
Looks like a query pre-processor converts the search:
Google no longer seems to be ignoring common words
into a query
Google "no longer" seems "to be" ignoring common words
I just did some simple searches. EG 'help for keyword'
I see what ncgimaker is saying... the results at the top were 'help for keyword' and then 'help (other stop words) keyword' then normal results, almost as if they are searching for the exact phrase and allowing for 'stop words' to be considered a part of the phrase.
EG searching for the exact phrase 'help (original stop word) keyword' and 'help (any other stop word) keyword'