We must not keep intermediate values in 32bit integers as they can
easily get too large for that. This change restores the behavior from
before change 10a14ced

, which coaxed
the compiler into using floats by stating the minimum constants as
"1.0".

Task-number: QTCREATORBUG-13391
Change-Id: Ie83337b7e2b09b37d94a31a07813de14b85152ee
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>