[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

[jakub at gcc dot gnu.org]

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For zero_extract RTL we require that the POS and LEN arguments are in the right
ranges, while bextr allows any values, and either uses 0 for bits outside of
the original operand and for LEN uses umin (len, <bitsize>).