RFR: 8271569: Rename cdsoffsets.cpp to cdsConstants.cpp

[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.

Tests: ter1-4

Thanks
Yumin

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Commit messages:
 - 8271569: Rename cdsoffsets.cpp to cdsConstants.cpp

Changes: https://git.openjdk.java.net/jdk/pull/5423/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5423&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271569
  Stats: 336 lines in 10 files changed: 163 ins; 129 del; 44 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5423.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5423/head:pull/5423

PR: https://git.openjdk.java.net/jdk/pull/5423