RFR: 8292267: Clean up synchronizer.hpp

[Coleen Phillimore]

On Fri, 12 Aug 2022 00:42:52 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Fix two problems with synchronizer.hpp:
> 
> - It's unnecessarily included in two popular headers: monitorChunk.hpp and frame_<cpu\>.hpp. The latter is most problematic because it includes synchronizer.hpp in the middle of a class declaration!
> - synchronizer.hpp includes linkedlist.hpp. This can be avoid by moving the definition of Synchronizer::PtrList into synchronizer.cpp.
> 
> These headers are included much less after this PR (out of ~1000 hotspot .o files)
> 
> 
> linkedlist.hpp    857 -> 101
> synchronizer.hpp  848 -> 122
> resourceHash.hpp  850 -> 270

Very nice.

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Marked as reviewed by coleenp (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9849