[PATCH][RTL-ifcvt] PR rtl-optimization/67465: Handle pairs of complex+simple blocks and empty blocks more gracefully

[Rainer Orth]

Hi Kyrill,

> Bootstrapped and tested on aarch64 and x86_64.
> Rainer, could you please try this patch in combination with the one I sent
> earlier at:
> https://gcc.gnu.org/ml/gcc-patches/2015-09/msg00815.html

it took me quite a bit, but I've now regtested those two patches: with
them both applied, the sparc-sun-solaris2.12 build succeeds and the two
gcc.c-torture/execute/20071216-1.c failures are gone.

So, from a SPARC POV the patches are good to go.

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University