RFR: 8274282: Remove special wait assert

[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.

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Commit messages:
 - Remove tests for special wait assert.
 - 8274245: sun/tools/jmap/BasicJMapTest.java Mutex rank failures

Changes: https://git.openjdk.java.net/jdk/pull/5684/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5684&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274282
  Stats: 57 lines in 4 files changed: 0 ins; 51 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