Summary: replace frequent C2 optimizer code patterns with new methods calls
Reviewed-by: kvn, twisti
Contributed-by: vladimir.x.ivanov@oracle.com

Summary: Use cl->is_valid_counted_loop() check.
Reviewed-by: never

Summary: Removed predicate cloning from loop peeling optimization and from split fall-in paths.
Reviewed-by: never

Summary: Do not move data nodes which are attached to a predicate test to a dominating test.
Reviewed-by: never

Summary: Fix integer overflow problem in the code generated by loop optimizer.
Reviewed-by: never

Reviewed-by: kvn, twisti

Summary: Clone loop predicate for clonned loops
Reviewed-by: never