RFR: 8271569: Clean up the use of CDS constants and field offsets [v7]

[Yumin Qi]

> Changed cdsOffsets.cpp to cdsConstants.cpp, now the offsets and constants are initialized static and searched separately.
> The offsets array could not use 'constexpr' since g++ on MacOs and VSC++ on Windows complained reinterpret_cast in 'offset_of' should not be used in constexpr initialization. Changed some field access for forming global list first.
> 
> Note with 'git mv' to rename cdsoffset.cpp to cdsConstants.cpp, same for cdsoffsets.hpp to cdsConstants.hpp, due to the contents changed more than 50% so git will not think cdsConstants.cpp is renamed from cdsoffsets.cpp. Instead, it is regarded as a new file.
> 
> Tests: ter1-4
> 
> Thanks
> Yumin

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

  Add back <cstddef> for additional platforms

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5450/files
  - new: https://git.openjdk.java.net/jdk/pull/5450/files/dfd65258..10ef5a4d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5450&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5450&range=05-06

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5450.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5450/head:pull/5450

PR: https://git.openjdk.java.net/jdk/pull/5450