Reviewed-by: lfoltan, coleenp

Summary: Add classLoader to java/lang/Class instance for fast access
Reviewed-by: alanb, lfoltan, rriggs, vlivanov, twisti, jfranck

Summary: Write klass and resolved_references constant pool fields lock free.
Reviewed-by: jrose, twisti

Summary: Checkpoint some missed do_space_filter.ksh cleanups for Contended Locking.
Reviewed-by: sspitsyn, lfoltan, coleenp

Summary: Initialize host_klass while parsing the class with the other initializations.
Reviewed-by: sspitsyn, stefank