RFR: 8253208: Move CDS related code to a separate class [v3]

[Yumin Qi]

> With more CDS related code added to VM, it is time to move CDS code to a separate class. CDS is the new class which is
> specific to CDS.
> Tests: tier1-4

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  8253208: Move CDS related code to a separate class

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/261/files
  - new: https://git.openjdk.java.net/jdk/pull/261/files/c01deec7..953b6bac

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=261&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=261&range=01-02

  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/261.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/261/head:pull/261

PR: https://git.openjdk.java.net/jdk/pull/261