8215026: Incorrect amount of memory unmapped with ImageFileReader::close()
Summary: Use map_size() instead of _index_size as the amount of memory to be unmapped while closing an image file
Reviewed-by: alanb, jlaskey
^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/.*