RFR (XS): 8007901 SA: Don't read flag values as constants

[Staffan Larsen]

Please review this small patch to avoid reading flag values in SA as constants. Reading them as constants  means SA will only see the default value for these flags. Instead the infrastructure in SA to read command line flags should be used. In addition the value if EnableInvokeDynamic is never used, so I removed that from SA.

webrev: http://cr.openjdk.java.net/~sla/8007901/webrev.00/
bug: http://bugs.sun.com/view_bug.do?bug_id=8007901 (not yet visible)

Thanks,
/Staffan