[pypy-issue] Issue #2028: UnrecognizedOperation: movbe (pypy/pypy)

[geov]

New issue 2028: UnrecognizedOperation: movbe
https://bitbucket.org/pypy/pypy/issue/2028/unrecognizedoperation-movbe

geov:

Gentoo build log attached.

CFLAGS was 
```
#!bash

CFLAGS="-march=core-avx2 -mtune=native -O2 -pipe"
```