[Bug target/69171] [6 Regression] error: unrecognizable insn: on x86_64 with -O2

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69171

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Created attachment 37244 [details]
> A patch

The patch fixes the regressions

FAIL: gcc.c-torture/compile/SFset.c   -O1  (internal compiler error)
...

I saw on x86_64-apple-darwin15 without further problem. Thanks.