hg: jdk/jdk: 8215026: Incorrect amount of memory unmapped with ImageFileReader::close()

[jini.george at oracle.com]

Changeset: 100818c5ddd0
Author:    jgeorge
Date:      2018-12-10 19:08 +0530
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/100818c5ddd0

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

! src/java.base/share/native/libjimage/imageFile.cpp