7173584: Implement arraycopy as a macro node Summary: delay the conversion of arraycopy to stub calls to macro expansion Reviewed-by: kvn, iveresov

8043284: Optimize signed integer comparison Summary: Folding of BoolNode if input add/sub of CmpI overflows and we can prove that compared value is not in the two resulting ranges. Added test for CmpI and CmpU optimizations. Reviewed-by: kvn, rbackman, roland