[Bug rtl-optimization/68189] [4.9/5/6 Regression] wrong code at -Os and above on x86_64-linux-gnu by RTL if-conversion

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68189

--- Comment #7 from Mikael Pettersson <mikpelinux at gmail dot com> ---
(In reply to Mikael Pettersson from comment #6)
> Started with r208165 (on x86_64-linux with -O3).

And the subsequent fix in r208222 does not help for this test case.