8191416: (bf) DirectByteBuffer extends MappedByteBuffer, confuses instanceof tests Summary: Change force(), load(), and isLoaded() not to throw UOE if there is no file mapping Reviewed-by: alanb, rriggs, forax

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*