RFR (S): 8238832: Obsolete PrintVMQWaitTime

[David Holmes]

webrev: http://cr.openjdk.java.net/~dholmes/8238832/webrev/
https://bugs.openjdk.java.net/browse/JDK-8238832

PrintVMQWaitTime was deprecated in JDK 15 under JDK-8236844 and is now 
obsoleted in JDK 16.

- The flag table entry is moved to the obsolete flags section.
- the entry in globals.hpp is removed
- the code in vmThread.cpp is removed

Testing:
  - local build
  - manual check:

 > ../build/linux-x64-debug/images/jdk/bin/java -XX:+PrintVMQWaitTime 
-version
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option 
PrintVMQWaitTime; support was removed in 16.0
java version "16-internal" 2021-03-16
Java(TM) SE Runtime Environment (fastdebug build 
16-internal+0-2020-06-12-0350435.daholme...)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 
16-internal+0-2020-06-12-0350435.daholme..., mixed mode, sharing)

Thanks,
David
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