8389128: G1: Avoid redundant card marks during remembered set rebuilding

[albertnetymk]

One-line patch to remove redundant card marking.

G1RebuildRemSetClosure currently invokes the G1 post-write barrier when it encounters a pointer into a young region. Post-write barriers already track these pointers when they are installed, including updates performed by GC, so marking the card containing the pointer again during the concurrent rebuild is unnecessary.

Test: tier1

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Issue

• JDK-8389128: G1: Avoid redundant card marks during remembered set rebuilding (Enhancement - P4)

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