RFR: 8370254: Add VM_MEMORY_JAVA mmap tag to MacOS mmap calls

[Evgeny Astigeevich]

On Fri, 17 Oct 2025 17:01:02 GMT, Nityanand Rai <duke at openjdk.org> wrote:

> Add VM_MEMORY_JAVA tag to mmap calls in os_bsd.cpp for better memory tracking of java process on macOs

The PR needs gtest/jtreg testing results.
Also it needs to be checks the new code is covered by existing gtests or new tests are needed.

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Changes requested by eastigeevich (Committer).

PR Review: https://git.openjdk.org/jdk/pull/27868#pullrequestreview-3394993477