[Bug target/57623] BEXTR intrinsic has memory operands switched around (fails to compile code)

[sgunderson at bigfoot dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57623

--- Comment #8 from sgunderson at bigfoot dot com ---
I really did spot the BZHI problem in actual code; that's how I found out :-) I
rewrote it slightly and the problem disappeared, though.