RFR: 8325478: Restructure the macro expansion compiler phase to not include macro elimination

[Saranya Natarajan]

This changeset restructures the macro expansion phase to not include macro elimination and also adds a flag StressMacroElimination which randomizes macro elimination ordering for stress testing purposes.

Changes:
- Implemented a method `eliminate_opaque_looplimit_macro_nodes` that removes the functionality for eliminating Opaque and LoopLimit nodes from the `expand_macro_nodes ` method. 
- Introduced compiler phases` PHASE_AFTER_MACRO_ELIMINATION` 
-  Added a new Ideal phase for individual macro elimination steps, allowing StressMacroElimination testing. 
- Implemented the flag `StressMacroElimination`. Added functionality tests for `StressMacroElimination`, similar to testing for previous stress flags such as `StressMacroExpansion` ([JDK-8317349](https://bugs.openjdk.org/browse/JDK-8317349)).

Below is a sample screenshot (IGV print level 5 with) mainly showing the new phase .
![image](https://github.com/user-attachments/assets/16013cd4-6ec6-4939-ac66-33bb03d59cd6)

Questions to reviewers: 
- Is the new macro elimination phase OK, or should we change anything?
- In `compile.cpp `, `PHASE_ITER_GVN_AFTER_ELIMINATION` follows `PHASE_AFTER_MACRO_ELIMINATION` in the current fix. Should `PHASE_ITER_GVN_AFTER_ELIMINATION` be removed ? 

Testing:
GitHub Actions
tier1 to tier5 on windows-x64, linux-x64, linux-aarch64, macosx-x64, and macosx-aarch64.
Tested that thousands of graphs are correctly opened and visualized with IGV using the same test used in  ([JDK-8317349](https://bugs.openjdk.org/browse/JDK-8317349))

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Commit messages:
 - Initial Fix

Changes: https://git.openjdk.org/jdk/pull/25682/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25682&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325478
  Stats: 75 lines in 11 files changed: 52 ins; 9 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/25682.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25682/head:pull/25682

PR: https://git.openjdk.org/jdk/pull/25682