RFR: 8278049: G1: add precondition to set_remainder_to_point_to_start [v2]

[Albert Mingkun Yang]

On Wed, 1 Dec 2021 18:14:51 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of converting always-false conditions to assertions.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   copyright

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6630