[Bug tree-optimization/53273] test-cases suffer from cross-function optimizations with no way to mark limits

[hp at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53273

--- Comment #6 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2012-05-09 
00:13:44 UTC ---
(In reply to comment #3)
> Usual way to avoid it in the
> testsuite is to put a loop into main().

Besides, the background of this PR (at the URL) is that I don't want a recipe
that works for this-optimization and this-code; I want a way to disable
cross-function-optimizations once and for all, preferably with defined
function-granular borders, like disabling in and out of specific functions.