RFR: 8325742: Remove MetaWord usage from MemRegion

[Stefan Karlsson]

There's a MemRegion constructor that takes MetaWord*s arguments. This is left-over from the permgen removal and it isn't used anymore. I propose that we remove it.

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Commit messages:
 - 8325742: Remove MetaWord usage from MemRegion

Changes: https://git.openjdk.org/jdk/pull/17828/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17828&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325742
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17828.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17828/head:pull/17828

PR: https://git.openjdk.org/jdk/pull/17828