Changes

Update differenceInAdditiveConstants as int64_t

`differenceInAdditiveConstants` is expected to be a
64 bit integer. `examineOpCodesForInductionVariableUse`
takes care of casting it into `int32_t` if it does not
use aladd and the adjustment or the replacing node
is not a 64-bit value.

Fixes: eclipse-openj9/openj9#19220

Signed-off-by: Annabelle Huo <Annabelle.Huo@ibm.com>
 (commit: 568b22e)