Prevent random floats from occasionally being greater than 1.

Previously, gen_f64 could generate numbers as high as 1.0000000002328306
in the case that u3 was 4294967295.0f64 and u2 was nonzero.  This change
divides the random numbers by 2**32 instead, effectively concatenating
their bits as apparently intended.  (Bonus fix: const.)

The comments are updated to be more specific than "random float"; note
that this can still generate 1.0f64 (P = 2**-54) due to rounding.

0 files changed, 0 insertions, 0 deletions