RFR(s): 8218041: Assorted wrong/missing includes

[Robbin Ehn]

Hi all, please review.

Code:
http://cr.openjdk.java.net/~rehn/8218041/webrev/
Issue:
https://bugs.openjdk.java.net/browse/JDK-8218041

After fixing these includes, there was a circular dependency via shenandoah
code. I moved try_cancel_gc to cpp where the only use was. So it never should
had been in the inline header in the first place.

I listed why the include is needed below.

Tier 1 and no pre-compiled.

FYI: I was investigating why Handle::Handle(Thread*,oop) was not inlined.
gcc complains there being a local comdat symbol, forcing it to be inlined or
using clang there is no issue. So it looks like a gcc bug both in 7.3 and 8.2.

Thanks, Robbin

src/hotspot/share/aot/aotLoader.cpp
runtime/os.inline.hpp      for os::dll_unload

src/hotspot/share/c1/c1_Runtime1.cpp
runtime/handles.inline.hpp for Handle(Thread*, oop)

src/hotspot/share/gc/z/zFuture.inline.hpp
runtime/interfaceSupport.inline.hpp not used.

src/hotspot/share/prims/nativeLookup.cpp
runtime/os.inline.hpp      for os::dll_unload

src/hotspot/share/runtime/handles.hpp
Forward declaration            Thread

src/hotspot/share/runtime/handles.inline.hpp
runtime/thread.hpp	   for Thread::current
oops/oop.inline.hpp        for oopDesc::is_a
oops/metadata.hpp          for is_valid

src/hotspot/share/runtime/semaphore.inline.hpp
runtime/thread.hpp         for osthread

src/hotspot/share/runtime/vframe.cpp
runtime/thread.inline.hpp  for JavaThread::class_to_be_initialized