8057650: uniform error diagnostics for inconsistent inherited method signatures
Summary: consolidate diagnostics for bad overrides
Reviewed-by: vromero
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt