A new VM argument type "double" is added by the fix for 6631166 causes a regression to com.sun.management.HotSpotDiagnosticsMXBean API that throws NPE.

The following test failures due to this regression:
  test/com/sun/management/HotSpotDiagnosticMXBean/GetDiagnosticOptions.java
  test/com/sun/management/HotSpotDiagnosticMXBean/SetAllVMOptions.java
  test/javax/management/MBeanServer/OldMBeanServerTest.java
 
java.lang.NullPointerException
at sun.management.HotSpotDiagnostic.getDiagnosticOptions(HotSpotDiagnostic.java:49)
at GetDiagnosticOptions.checkDiagnosticOptions(GetDiagnosticOptions.java:57)
at GetDiagnosticOptions.main(GetDiagnosticOptions.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:613)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:717)