[11u] RFR: JDK-8256287: [windows] add loop fuse to map_or_reserve_memory_aligned

[Thomas Stüfe]

Hi,

I'd like to get reviews for the backport of the following fix:

Original issue: https://bugs.openjdk.java.net/browse/JDK-8256287
Original patch: https://github.com/openjdk/jdk/commit/0357db35
Modified patch:
http://cr.openjdk.java.net/~stuefe/webrevs/backports/8256287-windows-add-loop-fuse-to-map_or_reserve_memory_aligned-for-11.diff

This patch had to be rewritten for 11 since most of the surroundings
changed since 11 due to cleanups. But the patch itself is straightforward.

Thank you, Thomas