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  1. JDK
  2. JDK-8336463

Parallel: Add PSOldGen::expand_and_allocate

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      `ParallelScavengeHeap::expand_heap_and_allocate` invokes `PSOldGen::allocate`, but the caller context (VM thread in safepoint) actually intends to expand-and-allocate in a single-threaded manner. Introduce a new API in PSOldGen for this use case.

            ayang Albert Yang
            ayang Albert Yang
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