RFR: 8308231: Faster MemAllocator::Allocation checks for verify/notification [v3]

[Ioi Lam]

On Fri, 11 Aug 2023 14:31:13 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I force-pushed because there were lots of changes in the related code and the merge was exceedingly tedious. The `MultiArrayAlloc` benchmarks improve, I am going to post more thorough benchmark results next week. Meanwhile, @iklam, do you want to give this a spin with [JDK-8310823](https://bugs.openjdk.org/browse/JDK-8310823) prototype? I think it would be sensitive to this change as well.

I had one variant of my  [JDK-8310823](https://bugs.openjdk.org/browse/JDK-8310823) prototype that avoids MemAllocator altogether (calling `CollectedHeap::mem_allocate` directly). There was a very minor benefit. See https://github.com/openjdk/jdk/pull/14520#issuecomment-1650961800

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PR Comment: https://git.openjdk.org/jdk/pull/14019#issuecomment-1675021514