RFR 8214807: Improve handling of very old class files

[Harold David Seigel]

Hi,

Please review this fix for JDK-8214807.  The fix changes handling of 
very old class files to be similar to class files whose version is < 52.

Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8214807/webrev/

JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8214807

The fix was regression tested by running Mach5 tiers 1 and 2 tests and 
builds on Linux-x64, Windows, and Mac OS X, running tiers 3-5 tests on 
Linux-x64, and by running JCK-12 API, Lang and VM tests on Linux-x64.

Thanks, Harold