Speed up some token processing

[Nathan Sidwell]

This patch speeds up token processing by moving some duplicated code
into a single switch statement.  It shows a surprisingly good speedup
of the Qt library of 1.5%.

Moving the TV_CPP timing to surround all of c_lex_with_flags will affect
the timing report slightly, but I don't think it worth worrying over much
about that.

There were a number of exit paths from c_lex_with_flags that did not go
through the no_more_pch check.  I suspect that if they occured at the
start of translation, they would be a parse error, but this fixes it up.

booted & tested on i686-pc-linux-gnu, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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