Replace Long wrapper object by long primitive type when an object is not
necessary:
 - The variable must be not null,
 - The result should not make more autoboxing/unboxing than the original
code.

Given:
        Long shouldBeAPrimitiveLong = Long.MIN_VALUE;
        aLong &= shouldBeAPrimitiveLong;
        anotherLong += shouldBeAPrimitiveLong;
        yetAnotherLong ^= shouldBeAPrimitiveLong;

When:
Applying "Primitive rather than wrapper" clean up...

Then:
        long shouldBeAPrimitiveLong = Long.MIN_VALUE;
        aLong &= shouldBeAPrimitiveLong;
        anotherLong += shouldBeAPrimitiveLong;
        yetAnotherLong ^= shouldBeAPrimitiveLong;

Also add tests for int primitives.

Change-Id: I63971c8154d4b1a2baa50704147d000e44882b11
Signed-off-by: Fabrice Tiercelin <fabrice.tiercelin@yahoo.fr>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/179166