RFR: JDK-8292073: NMT: remove unused constructor parameter from MallocHeader

[Thomas Stuefe]

Trivial change to remove an unused parameter from the constructor of MallocHeader

(Requires JDK-8292073)

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Commit messages:
 - JDK-8292073-NMT-remove-unused-constructor-parameter-from-MallocHeader
 - JDK-8292071-move-mallocheader-to-its-own-header

Changes: https://git.openjdk.org/jdk/pull/9802/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9802&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292073
  Stats: 572 lines in 5 files changed: 340 ins; 231 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9802.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9802/head:pull/9802

PR: https://git.openjdk.org/jdk/pull/9802