RFR: 8234930: Use MAP_JIT when allocating pages for code cache on macOS

[Thomas Stuefe]

On Mon, 28 Sep 2020 10:07:21 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> I am sorry, but I dislike the API changes to os::xxx(). As it is now, this API is quite convoluted, undocumented and
> inconsistent.

Just to clarify that I did not mean your change makes the API convoluted and inconsistent but that it has been that way
already, for a long time. It is a constant headache to get right, especially in ports whose memory management is a bit
non-standard, e.g. on AIX.

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PR: https://git.openjdk.java.net/jdk/pull/294