Fix Cast Float to Int overflows

- For Casting from Float to Integers, if the input float is greater
than INT_MAX, an overflow will happen when calling rint which causes the
clipplings to be ineffectives
- Moved all the range checks and clippings before rint to avoid this
  issue

Signed-off-by: Jerry Ge <jerry.ge@arm.com>
Change-Id: Ic189d59685b6d36464e3ef26766665148a660a14