8215644: Clean up globalDefinitions_<compiler>.hpp
Summary: Remove non-existent classes from forward declarations, delete unused functions, etc.
Reviewed-by: coleenp, kbarrett
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*
.*/.git/.*