[testcase] simplify_binary_operation test (was Re: -freduce-all-givs and fortran)

[Toon Moene]

Jan Hubicka wrote:

> I believe re-running makes sense when dealing with loop unrolling as
> it sometimes brings more opurtunities.

That would surprise me, as loop unrolling is only run after the last of
the two loop_optimize calls.

In the very first incantation I wrote of this sledgehammer approach to
recognising more givs, it indeed also ran loop unrolling twice, which
sometimes had the effect of unrolling a loop twice: Once in the first
round of loop optimisation and once (after enough insns were eliminated
due to the loop optimisation) in the second round.

However, this is history now (for at least three years).

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