RFR: 8319999: Refactor MetaspaceShared::use_full_module_graph() [v6]

[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 incrementally with one additional commit since the last revision:

  @calvinccheung review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16646/files
  - new: https://git.openjdk.org/jdk/pull/16646/files/33c9e39b..1c781799

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16646&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16646&range=04-05

  Stats: 3 lines in 3 files changed: 1 ins; 0 del; 2 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