Commits on Apr 8, 2021

1. AArch64: Properly find compressed refs sequence in implicit NULLCHK …

   `evaluateNULLCHKWithPossibleResolve` does pattern matching to
   find load operation in compressed references sequences, but it searches for
   `TR::i2l` instead of correct opcode `TR::iu2l`.
   Also, if it is a load operation and the reference count of the load node
   under the compressed refs sequence is 1, explicit NULLCHK is used
   even if the reference count of `TR::l2a` node is more than 2.
   
   This commit changes `evaluateNULLCHKWithPossibleResolve` to
   - Use opcode value of the parent of the reference node for judging
      whether it is a load operation instead of searching `TR::iu2l`.
   - Use implicit NULLCHK if `TR::l2a` node's reference count > 2.
   - Use recursivelyDecReferenceCount for firstChild if it is not evaluated.
   
   Signed-off-by: Akira Saitoh <saiaki@jp.ibm.com>

   Akira Saitoh committed Apr 8, 2021
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