[lworld] RFR: 8255522: [lworld] References to biased pattern remain in markWord::is_unlocked() [v2]

[David Simms]

> * more gtest mark word tests
> * assert any use of "biased locking" (there are some existing "has_biased_pattern()" asserts not guarded "UseBiasedLocking")
> * remove biased_lock_mask_in_place from is_unlocked

David Simms has updated the pull request incrementally with one additional commit since the last revision:

  Comments applied

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/245/files
  - new: https://git.openjdk.java.net/valhalla/pull/245/files/a1f25a77..aa579a9a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=245&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=245&range=00-01

  Stats: 2 lines in 2 files changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/245.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/245/head:pull/245

PR: https://git.openjdk.java.net/valhalla/pull/245