[Bug middle-end/90768] better range analysis for converting lt/gt into bit tests

[slandden at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90768

--- Comment #1 from Shawn Landden <slandden at gmail dot com> ---
Whoops I got that backwards, converting the bit test to a
greater-than-or-equal-to is better.