[gcov]: Improve type system

[Nathan Sidwell]

Hi,
The gcov types have to be consistent on both host and target. This patch
creates some typedefs so that things have the correct number of bits,
even where the target's plain int is tiny.

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

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
          The voices in my head said this was stupid too
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