6709093: Compressed Oops: reduce size of compiled methods Summary: exclude UEP size from nmethod code size and use narrow klass oop to load prototype header. Reviewed-by: jrose, never

cfeea66a3fa8ca3686a7cfa2d0ce8ab0169f168d jdk7-b24
cbc8ad9dd0e085a607427ea35411990982f19a36 jdk7-b25