RFR 8161603: [JVMCI] HotSpotVMConfig.baseVtableLength is incorrectly computed

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/8161603/webrev <http://cr.openjdk.java.net/~never/8161603/webrev>

baseVtableLength is computed from universeBaseVtableSize / vtableEntrySize but universeBaseVtableSize is in words and vtableEntrySize is in bytes so this returns 0 instead of the proper value.  I’ve added a test that would have caught this.  This has been broken in 9 for a long time but was only recently detected in 8 when we adopted most of the HotSpotVMConfig code from 9.

tom
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