8016729: ObjectAlignmentInBytes=16 now forces the use of heap based compressed oops
8005933: The -Xshare:auto option is ignored for -server
Summary: Move klass metaspace above the heap and support CDS with compressed klass ptrs.
Reviewed-by: coleenp, kvn, mgerdin, tschatzl, stefank

Summary: Wrote tests for use of CDS with ObjectAlignmentInBytes CL option
Reviewed-by: coleenp, ctornqvi, hseigel
Contributed-by: NMikhailo Seledtsov <mikhailo.seledtsov@oracle.com>