[Bug tree-optimization/67328] range test rather than single bit test for code testing enum values

[tetra2005 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67328

Yuri Gribov <tetra2005 at gmail dot com> changed:

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--- Comment #4 from Yuri Gribov <tetra2005 at gmail dot com> ---
Proposed patch in https://gcc.gnu.org/ml/gcc-patches/2017-01/msg01936.html