RFR: 8282096: G1: Remove redundant checks in G1CardSet::free_mem_object

[Albert Mingkun Yang]

On Fri, 18 Feb 2022 12:56:02 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing unnecessary checks.
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/7532