RFR: 8267914: Remove DeferredObjectToKlass workaround [v2]

[Stefan Karlsson]

> In JKD-8229839 we fixed a circular dependency problem between oop.inline.hpp and markWord.inline.hpp.  When JDK-8267464: 
> 'Circular-dependency resilient inline headers' gets integrated, this workaround isn't needed anymore.

Stefan Karlsson has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge remote-tracking branch 'origin/master' into 8267914_remove_DeferredObjectToKlass
 - 8267914: Remove DeferredObjectToKlass workaround

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Changes: https://git.openjdk.java.net/jdk/pull/4242/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4242&range=01
  Stats: 31 lines in 3 files changed: 1 ins; 22 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4242.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4242/head:pull/4242

PR: https://git.openjdk.java.net/jdk/pull/4242