RFR 8209899: [lworld] dcmd tests crash with "Unexpected constant pool layout"

[Harold David Seigel]

Hi,

Please review this fix for JDK-8209899.  (See bug for details.) The 
MethodAccessorGenerator.java changes were written by Mandy.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/lworld_8209899_dcmd/webrev/index.html

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8209899

The change was tested with Valhalla tiers 1-5 on multiple platforms.

Thanks! Harold