RFR: 8274282: Clarify special wait assert [v2]

[Coleen Phillimore]

> This change removes the assert and tests for Mutex::wait() only allowed with greater than nosafepoint ranked held locks.
> Tested with tier1-3.

Coleen Phillimore has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Fix wait checking code.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5684/files
  - new: https://git.openjdk.java.net/jdk/pull/5684/files/45b4776c..d5189887

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5684&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5684&range=00-01

  Stats: 70 lines in 4 files changed: 64 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5684.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5684/head:pull/5684

PR: https://git.openjdk.java.net/jdk/pull/5684