RFR: 8261868: Reduce inclusion of metaspace.hpp

[Ioi Lam]

metaspace.hpp is included by about 770 out of 1000 HotSpot .o files. Most of these are transitively included via array.hpp and classLoaderData.hpp.

- classLoaderData.hpp doesn't actually need metaspace.hpp.
- array.hpp can be refactored to put a function that depends on metaspace.hpp into array.inline.hpp

Doing the above reduces the number of .o files that include metaspace.hpp to 343. Since this is still a significant number, we should split out the rarely used classes (such as `MetaspaceGC` and `MetaspaceUtils`) into a new header file (metaspaceUtils.hpp, which is included only 30 times).

Also, these 3 includes can now be removed from metaspace.hpp.

#include "memory/memRegion.hpp"
#include "memory/metaspaceChunkFreeListSummary.hpp"
#include "memory/virtualspace.hpp"

Tested with mach5: tier1, builds-tier2, builds-tier3, builds-tier4 and builds-tier5. Also locally: aarch64, arm, ppc64, s390, x86, and zero.

(I also fixed an unrelated comment in archiveUtils.cpp when I was scanning for the word "Metaspace" in the source files -- the function `MetaspaceShared::commit_to()` no longer exists).

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Commit messages:
 - step2
 - step 1

Changes: https://git.openjdk.java.net/jdk/pull/2599/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2599&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261868
  Stats: 361 lines in 49 files changed: 221 ins; 132 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2599.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2599/head:pull/2599

PR: https://git.openjdk.java.net/jdk/pull/2599