Several fixes to array handling code in C2 to align with the JEP 401 design.
            
- relates to
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                    JDK-8331720 [lworld] Remove _lh_null_free -           
- Closed
 
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                    JDK-8333037 [lworld] Part 2: Prepare compiler implementation and tests for JEP 401 -           
- Resolved
 
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