RFR: JDK-8292071: NMT: move MallocHeader to its own header and inline header checks

[Thomas Stuefe]

On Wed, 10 Aug 2022 11:00:36 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> Changes are duplicated by #9802. Why this? Isn't this one obsolete then?

#9802 builds atop of this PR. I experimented with PR sequences to speed up work while keeping changes fine granular and easy to review.

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PR: https://git.openjdk.org/jdk/pull/9801