RFR 8241934: Simplify parse_stream() and remove has_class_mirror_holder_cld()

[Harold Seigel]

Hi,

Please review this change to simplify creation of class loader datas for 
unsafe anonymous classes and for hidden classes that are not strong.  
This change was originally proposed by coleenp.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/bug_8241934/webrev/index.html

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8241934

The fix was regression tested by running Mach5 tiers 1 and 2 tests and 
builds on Linux-x64, Solaris, Windows, and Mac OS X, by running Mach5 
tiers 3-5 tests on Linux-x64, and running tiers 6 and 7 tests (in 
progress) on Windows.

Thanks, Harold