RFR: 8319999: Refactor MetaspaceShared::use_full_module_graph() [v5]

[Ioi Lam]

> This is another step of moving CDS config management into cdsConfig.hpp:
> 
> The function `MetaspaceShared::use_full_module_graph()` is split into two:
> - `CDSConfig::is_dumping_full_module_graph()`
> - `CDSConfig::is_loading_full_module_graph()`

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' into 8319999-refactor-metaspaceshared-use-full-module-graph
 - fixed white spaces
 - Changed flag to CDSConfig::_dumping_full_module_graph_disabled
 - rename FileMapHeader::_use_full_module_graph -> _has_full_module_graph
 - 8319999: Refactor MetaspaceShared::use_full_module_graph()

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16646/files
  - new: https://git.openjdk.org/jdk/pull/16646/files/da947425..33c9e39b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16646&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16646&range=03-04

  Stats: 4209 lines in 116 files changed: 2715 ins; 881 del; 613 mod
  Patch: https://git.openjdk.org/jdk/pull/16646.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16646/head:pull/16646

PR: https://git.openjdk.org/jdk/pull/16646