[SYCL] fix a behavior mismatch in ann_ptr operator

[broxigarchen]

Fixed two issues:

1. For compound operators, there is an error in the specs. The tmp = tmp Op rhs statement is wrong since Op is defined as += and for += it will be tmp = tmp += rhs. Correct the format
2. For compound operators and inc/dec operators, the old implementation is using the non-compound operator which sounds wrong.
   i.e. If T is a customer type with only += operator being defined, when applying += on annotated_ref<T>, the previous implementation errors out since there is no + defined in T.
3. Added the missing const to inc/dec operators

[rolandschulz]

The version in the table is still missing the const (e.g. line 606). Also we should be more explicit about how the incr/decr works (the same operator is used on a temporary).

[maarquitos14]

RT changes LGTM.

[broxigarchen]

The version in the table is still missing the const (e.g. line 606). Also we should be more explicit about how the incr/decr works (the same operator is used on a temporary).

done

[tiwaria1]

How was this caught? Are there any tests we can add for this and other such operator usage?

[broxigarchen]

How was this caught? Are there any tests we can add for this and other such operator usage?

Found this during testing. Yes I will add it to the test code