[gcov]: Fix loop detection

[Nathan Sidwell]

Hi,
I've installed this obvious fix for the loop detection needed in gcov's
all-block mode - silly me was using the wrong algorithm. It also tweaks
which line blocks are attached to in that mode (their last), which fits
better with non-block mode, and user intuition.

booted & tested on i686-pc-linux-gnu.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
          The voices in my head said this was stupid too
nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org

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