RFR (M) JDK-8210012: Implement Unified Logging Option for -XX:+TraceMethodHandles and -XX:+TraceInvokeDynamic

[Lois Foltan]

Please review the following change to implement unified logging options 
for -XX:+TraceMethodHandles and -XX:+TraceInvokeDynamic. The new options 
map as follows:

-XX:+TraceMethodHandles --> -Xlog:methodhandles=info
-XX:+TraceInvokeDynamic -->  -Xlog:methodhandles+indy=debug

and in addition dynamic constants can now be viewed under their own 
option via -Xlog:methodhandles+condy=debug

open webrev at: http://cr.openjdk.java.net/~lfoltan/bug_jdk8210012.0/webrev/
bug link: https://bugs.openjdk.java.net/browse/JDK-8210012

Testing: hs-tier1-5

Thanks,
Lois