[Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763

--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mike Lothian from comment #12)
> Created attachment 41960 [details]
> si_shader objdumps

We need a small testcase in C.