[Bug target/63661] [4.9/5 Regression] -O2 miscompiles with -mtune=nehalem or corei7

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63661

--- Comment #21 from H.J. Lu <hjl.tools at gmail dot com> ---
It was fixed by r217783 on trunk and the fix also works
on 4.9 branch.  Is is the real fix?