prevent segfault on amd64 when -Wmissing-include-dirs -I/nonexistent
(happens even with empty files), as diagnosed with kili@ on
evolution-database.

We obviously need to check the token chain and go

prevent segfault on amd64 when -Wmissing-include-dirs -I/nonexistent
(happens even with empty files), as diagnosed with kili@ on
evolution-database.

We obviously need to check the token chain and go up if we're at the start
of a buffer (unless we're really at the start unless we have to give up).

Independent fix. Same functionality as code found on the gcc 4.5 branch,
but completely different lines.

okay miod@

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import of gcc-4.2.1, the last gcc release under GPLv2