nonproduct and develop flags should not be printed by product build

All nonproduct and develop flags are added to the flagTable.

http://hg.openjdk.java.net/jdk/jdk/file/2fbc66ef1a1d/src/hotspot/share/runtime/flags/jvmFlag.cpp#l825

The only purpose seems to be printing a warning message when these flags are used

$ java -XX:+TraceInvocationCounterOverflow -version
Error: VM option 'TraceInvocationCounterOverflow' is notproduct and is available only in debug version of VM.
$ java -XX:+TraceInvocationCounterOverflo -version
Unrecognized VM option 'TraceInvocationCounterOverflo'
Did you mean '(+/-)TraceInvocationCounterOverflow'? Error: Could not create the Java Virtual Machine.

Since these flags cannot be set in product builds, printing a message about them doesn't seem that helpful.

We should remove the entries of these flags from flagTable to save space, and make JVMFlag::find_flag() faster.