Use double temporaries when computing group size
Use double temporaries when computing group size

If we use float temporaries when computing the bounds of
a group, then, depending on what variables are kept in registers
and what stored on the stack, the accumulated difference between
natural_width and min_width can be more than FLOAT_EPSILON.

Using double temporaries will eliminate the difference in most
cases, or, very rarely, reduce it to a last-bit error.

http://bugzilla.openedhand.com/show_bug.cgi?id=1632

Signed-off-by: Emmanuele Bassi <049ee2061f71220e5aaf33f5be422fc2a2b06a44@linux.intel.com>

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