ClassPrinter prints `null` values as `String` "null" or as 
`String.valueOf(ConstantDescs.BSM_NULL_CONSTANT)`, based on context.

This patch unifies handling of `null` values.
They are now exclusively represented as `ConstantDescs.BSM_NULL_CONSTANT`.
In Json and Yaml format is `null` value printed unquoted and in Xml as 
`<null/>`.
In Json and Yaml is `"null"` `String` printed quoted to distinguish from the 
`null` value.

Please review.

Thank you,
Adam

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

Commit messages:
 - 8344841: ClassPrinter prints confusing value for null

Changes: https://git.openjdk.org/jdk/pull/22316/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22316&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344841
  Stats: 30 lines in 2 files changed: 18 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/22316.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22316/head:pull/22316

PR: https://git.openjdk.org/jdk/pull/22316

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