All JIT Power work for "Improvements for Relocatable Compilations #2921"

[gita-omr]

Power work for #2921

[gita-omr]

Discussed with @aviansie-ben, @zl-wang and @vijaysun-omr : code is functionally stable, no known issues, but still more testing and performance tuning needs to be done.

[aviansie-ben]

I've started opening PRs to get this functionality merged. The PRs that need to be merged before this can be considered complete are:

• OpenJ9: Add support for SVM relocations to Power AheadOfTimeCompile (Add support for SVM relocations to Power AheadOfTimeCompile #4742)
• OpenJ9: Fix improper J9Class materialization during IL generation (Fix improper J9Class materialization during IL generation #4729)
• OpenJ9: Disable callerClassLoader optimization under AOT (Disable callerClassLoader optimization under AOT #4727)
• OpenJ9: Add SVM profiled class records for checkcast/instanceof (Add SVM profiled class records for checkcast/instanceof #4744)
• OMR: Fix check for whether wide relocation offsets are needed on Power (Fix check for whether wide relocation offsets are needed on Power eclipse-omr/omr#3567)
• OMR: Add Power-specific relocation types needed for SVM AOT (Add Power-specific relocation types needed for SVM AOT eclipse-omr/omr#3566)
• OpenJ9: Add Power-specific relocation types needed for SVM AOT (Add Power-specific relocation types needed for SVM AOT #4781)
• OMR: Add support for generating SVM relocations on Power (Add support for generating SVM relocations on Power eclipse-omr/omr#3575)
• OpenJ9: Add support for generating SVM relocations on Power (Add support for generating SVM relocations on Power #4777)
• OpenJ9: Enable Symbol Validation Manager on Power (Enable Symbol Validation Manager on Power #4841)

[gita-omr]

@aviansie-ben is pretty much on track for enabling this in 0.13 so moving back to 0.13.

[aviansie-ben]

The last PR for this work has been merged, so this issue can be closed now.