RFR: 8299274: Add elements to resolved_references consistently

[Coleen Phillimore]

I added a resolved_references_at and set_resolved_references_at() functions to use for accesses to the resolved_references array, except for the CDS usages. This has an assert that the element is an oop and oob checks and setting elements use a CAS consistently.
These asserts seem useful for finding the bug causing https://bugs.openjdk.org/browse/JDK-8296915.
Tested with tiers1-4.

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Commit messages:
 - Fix copyrights
 - 8299274: Add elements to resolved_references consistently

Changes: https://git.openjdk.org/jdk/pull/11834/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299274
  Stats: 49 lines in 8 files changed: 20 ins; 4 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/11834.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11834/head:pull/11834

PR: https://git.openjdk.org/jdk/pull/11834