[Bug tree-optimization/53986] missing vrp on bit-mask test, LSHIFT_EXPR not handled

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53986

--- Comment #10 from vries at gcc dot gnu.org 2012-08-06 08:37:51 UTC ---
> This tentative patch fixes the problem. I'm currently testing it, let's see if
> I run into any trouble.

Committed in r190168.