[Bug target/65368] [4.8/4.9/5 Regression]_bzhi_u32 intrinsic generates incorrect code when -O1 or above is specified and index is an immediate

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65368

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #1)

> Wonder how many other bmi/bmi2 instructions have similar problems.

Looking through i386.md file, it looks others are OK, although it is possible
to implement bmi_bextr with zero_extract RTX (removing one unspec).