[10] RFR(XS): 8174101: Bootclasspath append should not invalidate CDS archive

[Calvin Cheung]

For the regular CDS case (UseAppCDS=0), only boot classes are loaded 
from the archive. Therefore, we should not invalidate the archive when 
the bootclasspath is appended.

bug: https://bugs.openjdk.java.net/browse/JDK-8174101

webrev: http://cr.openjdk.java.net/~ccheung/8174101/webrev.00/

Testing: hs-tier1 and hs-tier2 on linux-x64, solaris-sparc, macosx, 
windows-x64.

thanks,
Calvin