hg: panama/dev: fix vpermb encoding

[vivek.r.deshpande at intel.com]

Changeset: 1909b6cc6c93
Author:    vdeshpande
Date:      2018-10-12 17:12 -0700
URL:       http://hg.openjdk.java.net/panama/dev/rev/1909b6cc6c93

fix vpermb encoding

! src/hotspot/cpu/x86/assembler_x86.cpp