RFR: JDK-8246478 Remove src/utils/reorder

[Magnus Ihse Bursie]

The tools in src/utils/reorder was used to produce the "reorder" map 
files, which were used as an early optimization technique for native 
libraries.

We have not used reorder files for a long time; they have all been gone, 
but the reorder tool was not removed at the time. Time to fix it.

Bug: https://bugs.openjdk.java.net/browse/JDK-8246478
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8246478-remove-reorder-tool/webrev.01

/Magnus