Hi all,

This patch fixes the aarch64 bootstrap failure I've encountered.
Richi suggested on IRC that we should be using .ulow () on the wide_int insetad of
accessing elt (0) as that doesn't play well with the uninit analysis.

Bootstrapped and tested on aarch64-none-linux-gnu.

Committing to trunk in the interest of fixing the build

2017-03-03  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/aarch64/aarch64.c (aarch64_float_const_representable_p):
     Use wide_int::ulow () instead of .elt (0).