8135284: Remove Method::_method_size field Summary: Remove Method::_method_size to improve memory footprint after JDK-8135085,which increased 4 bytes for 32 platform. Also removed related unused code in SA. Reviewed-by: coleenp, hseigel

^build/
^dist/
nbproject/private/
^webrev
^.hgtip
^.bridge2
.DS_Store