RFR: 8261868: Reduce inclusion of metaspace.hpp [v2]

[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).

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  fixed ppc/s390 builds

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2599/files
  - new: https://git.openjdk.java.net/jdk/pull/2599/files/7a32ad1d..700d1c16

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2599&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2599&range=00-01

  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 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