RFR: 8371637: allocateNativeInternal sometimes return incorrectly aligned memory

[Maurizio Cimadamore]

On Wed, 12 Nov 2025 11:19:51 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> The problem is: how do we discover these constants?

Note: we can't just do a "trial allocation" of 4 bytes and see what comes out -- we might just be "lucky" and see an 8-byte aligned address, even though the underlying allocator is aligning at 4 bytes...

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PR Comment: https://git.openjdk.org/jdk/pull/28235#issuecomment-3521438964