Summary: fix some misc things to build fastdebug version dragonwell8: fastdebug version has `-DCHECK_UNHANDLED_OOPS` which will make `oop` as an object instead of a pointer.

Test Plan: build Dragonwell in fastdebug mode

Reviewed-by: luchsh,D-D-H

Issue: https://github.com/alibaba/dragonwell8/issues/82

Summary: Fix build issues caused by object allocation profiling on Windows/Mac

Test Plan: build Dragonwell 8 successfully on Linux/Windows/Mac

Reviewed-by: zhengxiaolinX, luchsh, sanhong

Issue: https://github.com/alibaba/dragonwell8/issues/74

Summary: add support for opto object allocations sampling

Test Plan: test/jfr/event/objectsprofiling/TestOptoObjectAllocationsSampling.java

Reviewers: zhengxiaolinX, luchsh, sanhong

Issue: https://github.com/alibaba/dragonwell8/issues/64