RFR: 8292267: Clean up synchronizer.hpp [v3]

[Ioi Lam]

> 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

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into 8292267-clean-up-synchronizer-hpp
 - @dcubed-ojdk review comments - reorder class forward declarations
 - added back inlined functions in case their performance matters
 - fixed copyright
 - 8292267: Clean up synchronizer.hpp

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Changes: https://git.openjdk.org/jdk/pull/9849/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9849&range=02
  Stats: 54 lines in 21 files changed: 28 ins; 21 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/9849.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9849/head:pull/9849

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