RFR: 8359603: Missed optimization in PhaseIterGVN for redundant ConvX2Y->ConvY2X->ConvX2Y sequences due to missing notification in PhaseIterGVN::add_users_of_use_to_worklist

[Benoît Maillard]

This PR addresses a missed optimization in `PhaseIterGVN` due to the lack of change notification to indirect users within `PhaseIterGVN::add_users_of_use_to_worklist` (again). This is similar to [JDK-8361700](https://bugs.openjdk.org/browse/JDK-8361700?filter=-1).

The optimization in question is the removal of redundant `ConvX2Y->ConvY2X->ConvX2Y` sequences (where `X` and `Y` are primitive number types), which get replaced by a single `ConvX2Y` as an identity optimization. This missing optimization was originally reported only for `ConvD2LNode`, but it turns out that other conversion nodes have analog optimization patterns. After manual inspection of identity optimizations in `convertnode.cpp`, I was able to reproduce missing optimizations for the following conversion sequences:
- `ConvD2L->ConvL2D->ConvD2L`
- `ConvF2I->ConvI2F->ConvF2I`
- `ConvF2L->ConvL2F->ConvF2L`
- `ConvI2F->ConvF2I->ConvI2F`

Similar optimization patterns exist for additional conversion nodes. However, it is not clear if these nodes are subject to the same missed optimization issue. Further investigation may be needed, as I was unable to reproduce such cases with simple tests.

This is again a case where an optimization depends on the input of its input. Currently, `PhaseIterGVN::add_users_of_use_to_worklist` contains specific logic to handle similar dependencies for other cases, but this specific scenario is not addressed. The proposed fix adds the necessary logic in `add_users_of_use_to_worklist` to ensure proper notification for this optimization pattern. 

### Testing
- [x] [GitHub Actions](https://github.com/benoitmaillard/jdk/actions?query=branch%3AJDK-8359603)
- [x] tier1-3, plus some internal testing
- [x] Added test from the fuzzer, and tests for other sequences (manually derived from the original one)

Thank you for reviewing!

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

Commit messages:
 - Merge branch 'master' of https://git.openjdk.org/jdk into JDK-8359603
 - 8359603: Remove switch in tests
 - 8359603: Rename test and add cases for other number types with analog optimization patterns
 - 8359603: Add other similar conversion patterns for which a missing opt could be trigerred
 - 8359603: Add opcode check on current node
 - 8359603: Add comment explaining the notification
 - 8359603: Add test from fuzzer
 - 8359603: Add missing notification

Changes: https://git.openjdk.org/jdk/pull/26368/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26368&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359603
  Stats: 123 lines in 2 files changed: 123 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26368.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26368/head:pull/26368

PR: https://git.openjdk.org/jdk/pull/26368